Release 2.2.0

Propagate internal errors to the master node

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,15 @@
+Thanks for submitting a PR, your contribution is really appreciated!
+
+Here's a quick checklist that should be present in PRs:
+
+- [ ] Make sure to include reasonable tests for your change if necessary
+
+- [ ] We use [towncrier](https://pypi.python.org/pypi/towncrier) for changelog management, so please add a *news* file into the `changelog` folder following these guidelines:
+  * Name it `$issue_id.$type` for example `588.bugfix`;
+  * If you don't have an issue_id change it to the PR id after creating it
+  * Ensure type is one of `removal`, `feature`, `bugfix`, `vendor`, `doc` or `trivial`
+  * Make sure to use full sentences with correct case and punctuation, for example:
+
+    ```
+    Fix issue with non-ascii contents in doctest text files.
+    ```

.github/workflows/main.yml

@@ -0,0 +1,99 @@
+name: build
+
+on: [push, pull_request]
+
+jobs:
+  build:
+
+    runs-on: ${{ matrix.os }}
+
+    strategy:
+      fail-fast: false
+      matrix:
+        tox_env:
+          - "py35-pytestlatest"
+          - "py36-pytestlatest"
+          - "py37-pytestlatest"
+          - "py38-pytestlatest"
+          - "py39-pytestlatest"
+          - "py38-pytestmaster"
+          - "py38-psutil"
+          - "linting"
+
+        os: [ubuntu-latest, windows-latest]
+        include:
+          - tox_env: "py35-pytestlatest"
+            python: "3.5"
+          - tox_env: "py36-pytestlatest"
+            python: "3.6"
+          - tox_env: "py37-pytestlatest"
+            python: "3.7"
+          - tox_env: "py38-pytestlatest"
+            python: "3.8"
+          - tox_env: "py39-pytestlatest"
+            python: "3.9"
+          - tox_env: "py38-pytestmaster"
+            python: "3.8"
+          - tox_env: "py38-psutil"
+            python: "3.8"
+          - tox_env: "linting"
+            python: "3.7"
+
+    steps:
+    - uses: actions/checkout@v1
+    - name: Set up Python
+      uses: actions/setup-python@v1
+      with:
+        python-version: ${{ matrix.python }}
+    - name: Install tox
+      run: |
+        python -m pip install --upgrade pip
+        pip install tox
+    - name: Test
+      run: |
+        tox -e ${{ matrix.tox_env }}
+
+  linting:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v1
+    - name: Set up Python
+      uses: actions/setup-python@v1
+      with:
+        python-version: "3.7"
+    - name: Install tox
+      run: |
+        python -m pip install --upgrade pip
+        pip install tox
+    - name: Linting
+      run: |
+        tox -e linting
+
+  deploy:
+
+    if: github.event_name == 'push' && startsWith(github.event.ref, 'refs/tags')
+
+    runs-on: ubuntu-latest
+
+    needs: [build, linting]
+
+    steps:
+    - uses: actions/checkout@v1
+    - name: Set up Python
+      uses: actions/setup-python@v1
+      with:
+        python-version: "3.7"
+    - name: Install wheel
+      run: |
+        python -m pip install --upgrade pip
+        pip install wheel
+    - name: Build package
+      run: |
+        python setup.py sdist bdist_wheel
+    - name: Publish package to PyPI
+      uses: pypa/gh-action-pypi-publish@master
+      with:
+        user: __token__
+        password: ${{ secrets.pypi_token }}

.gitignore

@@ -22,11 +22,14 @@ dist/
 include/
 lib/
 bin/
-xdist/_version.py*
+env/
+src/xdist/_version.py*
 pytest_xdist.egg-info
 issue/
 3rdparty/
 pytestdebug.log
 .tox/
 .cache/
+.pytest_cache/
 .eggs/
+.idea/

.hgtags

@@ -1,21 +0,0 @@
-42c6503ee48fae9c4c96d406afb12bfc86f15803 1.0
-eca7ce17eabf296983c36812c8b8be901e7055a3 1.1
-56d8e5280be224a0ad3220a9deed55334710bd23 1.2
-e6c4ce20db4bf65086ff55807a3c306cad7ca393 1.3
-e6c4ce20db4bf65086ff55807a3c306cad7ca393 1.3
-eaf8b1cb7c312883598677231be5bbeea3b5c127 1.3
-a423748bf17ee778a37853225210257699cad9c1 1.4
-cd44a941c833c098e4899fe3d42a96703754d0d5 1.5
-4815040bdad8f182a5487f57a9da385483836e75 1.6
-20875fed94e7f3dff50bdf762df91153b15ceca6 1.7
-20875fed94e7f3dff50bdf762df91153b15ceca6 1.7
-29c38e195526f5f0fdd651fb51f59d6efaaafbb0 1.7
-0d1c00018008433956aa7d93007bab6ea7de96e4 1.8
-0d1c00018008433956aa7d93007bab6ea7de96e4 1.8
-1d27987c267577899350a25ba5828d55d87083ad 1.8
-5c5cb6d59e12e566fbb0217aea718dc31578bee1 1.9
-4406fc2a6427fadc021ed7e43e7aa5032b1ea91f 1.10
-220f6e46eb71a6212ccbe6b67b9e6edcf8ee4fa5 1.11
-39ef85dbc893cc63dede11601208098a667b58e9 1.12
-4e25f4c568be2d7cb4d1739638a9e66bbf28f588 v1.13
-67ff3aa4d294f75ade0ebf03267e5739e1bd9473 v1.13.1

.pre-commit-config.yaml

@@ -0,0 +1,29 @@
+repos:
+-   repo: https://github.com/ambv/black
+    rev: 19.10b0
+    hooks:
+    -   id: black
+        args: [--safe, --quiet, --target-version, py35]
+        language_version: python3.7
+-   repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v2.4.0
+    hooks:
+    -   id: trailing-whitespace
+    -   id: end-of-file-fixer
+    -   id: check-yaml
+    -   id: debug-statements
+    -   id: flake8
+-   repo: https://github.com/asottile/pyupgrade
+    rev: v2.7.2
+    hooks:
+    -   id: pyupgrade
+        args: [--py3-plus]
+-   repo: local
+    hooks:
+    -   id: rst
+        name: rst
+        entry: rst-lint --encoding utf-8
+        files: ^(CHANGELOG.rst|HOWTORELEASE.rst|README.rst|changelog/.*)$
+        language: python
+        additional_dependencies: [pygments, restructuredtext_lint]
+        language_version: python3.7

.travis.yml

@@ -1,46 +0,0 @@
-sudo: false
-language: python
-python:
-    - '3.5'
-# command to install dependencies
-install: "pip install -U tox setuptools_scm"
-# # command to run tests
-env:
-  matrix:
-  - TESTENV=flakes
-  - TESTENV=readme
-  # matrix was trimmed to skip
-  # some builds that are unnecessary/perceived redundant:
-  # py27 and py35 are tested with all pytest versions we declare to support;
-  # py26 and py34 only with latest pytest versions.
-  # pytest24,25,26 don't work on py35 due to changes in ast module
-  - TESTENV=py26-pytest27
-  - TESTENV=py26-pytest28
-
-  - TESTENV=py27-pytest24
-  - TESTENV=py27-pytest25
-  - TESTENV=py27-pytest26
-  - TESTENV=py27-pytest27
-  - TESTENV=py27-pytest28
-
-  - TESTENV=py34-pytest27
-  - TESTENV=py34-pytest28
-
-  - TESTENV=py35-pytest27
-  - TESTENV=py35-pytest28
-
-  - TESTENV=py27-pytest28-pexpect
-  - TESTENV=py34-pytest28-pexpect
-  - TESTENV=pypy-pytest28
-
-script: tox --recreate -e $TESTENV
-
-notifications:
-  irc:
-    channels:
-      - "chat.freenode.net#pytest"
-    on_success: change
-    on_failure: change
-    skip_join: true
-  email:
-    - pytest-commit@python.org

CHANGELOG

@@ -1,194 +0,0 @@
-1.14
-----
-
-- new hook: ``pytest_xdist_node_collection_finished(node, ids)``, called when
-  a worker has finished collection. Thanks Omer Katz for the request and
-  Bruno Oliveira for the PR.
-
-- fix README display on pypi
-
-- fix #22: xdist now works if the internal tmpdir plugin is disabled.
-  Thanks Bruno Oliveira for the PR.
-
-- fix #32: xdist now works if looponfail or boxed are disabled.
-  Thanks Bruno Oliveira for the PR.
-
-
-1.13.1
--------
-
-- fix a regression -n 0 now disables xdist again
-
-
-1.13
--------------------------
-
-- extended the tox matrix with the supported py.test versions
-
-- split up the plugin into 3 plugin's
-  to prepare the departure of boxed and looponfail.
-
-  looponfail will be a part of core
-  and forked boxed will be replaced
-  with a more reliable primitive based on xdist
-
-- conforming with new pytest-2.8 behavior of returning non-zero when all
-  tests were skipped or deselected.
-
-- new "--max-slave-restart" option that can be used to control maximum
-  number of times pytest-xdist can restart slaves due to crashes. Thanks to
-  Anatoly Bubenkov for the report and Bruno Oliveira for the PR.
-
-- release as wheel
-
-- "-n" option now can be set to "auto" for automatic detection of number
-  of cpus in the host system. Thanks Suloev Dmitry for the PR.
-
-1.12
--------------------------
-
-- fix issue594: properly report errors when the test collection
-  is random.  Thanks Bruno Oliveira.
-
-- some internal test suite adaptation (to become forward
-  compatible with the upcoming pytest-2.8)
-
-
-1.11
--------------------------
-
-- fix pytest/xdist issue485 (also depends on py-1.4.22):
-  attach stdout/stderr on --boxed processes that die.
-
-- fix pytest/xdist issue503: make sure that a node has usually
-  two items to execute to avoid scoped fixtures to be torn down
-  pre-maturely (fixture teardown/setup is "nextitem" sensitive).
-  Thanks to Andreas Pelme for bug analysis and failing test.
-
-- restart crashed nodes by internally refactoring setup handling
-  of nodes.  Also includes better code documentation.
-  Many thanks to Floris Bruynooghe for the complete PR.
-
-
-1.10
--------------------------
-
-- add glob support for rsyncignores, add command line option to pass
-  additional rsyncignores. Thanks Anatoly Bubenkov.
-
-- fix pytest issue382 - produce "pytest_runtest_logstart" event again
-  in master. Thanks Aron Curzon.
-
-- fix pytest issue419 by sending/receiving indices into the test
-  collection instead of node ids (which are not neccessarily unique
-  for functions parametrized with duplicate values)
-
-- send multiple "to test" indices in one network message to a slave
-  and improve heuristics for sending chunks where the chunksize
-  depends on the number of remaining tests rather than fixed numbers.
-  This reduces the number of master -> node messages (but not the
-  reverse direction)
-
-
-1.9
--------------------------
-
-- changed LICENSE to MIT
-
-- fix duplicate reported test ids with --looponfailing
-  (thanks Jeremy Thurgood)
-
-- fix pytest issue41: re-run tests on all file changes, not just
-  randomly select ones like .py/.c.
-
-- fix pytest issue347: slaves running on top of Python3.2
-  will set PYTHONDONTWRITEYBTECODE to 1 to avoid import concurrency
-  bugs.
-
-1.8
--------------------------
-
-- fix pytest-issue93 - use the refined pytest-2.2.1 runtestprotocol
-  interface to perform eager teardowns for test items.
-
-1.7
--------------------------
-
-- fix incompatibilities with pytest-2.2.0 (allow multiple
-  pytest_runtest_logreport reports for a test item)
-
-1.6
--------------------------
-
-- terser collection reporting
-
-- fix issue34 - distributed testing with -p plugin now works correctly
-
-- fix race condition in looponfail mode where a concurrent file removal
-  could cause a crash
-
-1.5
--------------------------
-
-- adapt to and require pytest-2.0 changes, rsyncdirs and rsyncignore can now
-  only be specified in [pytest] sections of ini files, see "py.test -h"
-  for details.
-- major internal refactoring to match the pytest-2.0 event refactoring
-  - perform test collection always at slave side instead of at the master
-  - make python2/python3 bridging work, remove usage of pickling
-- improve initial reporting by using line-rewriting
-- remove all trailing whitespace from source
-
-1.4
--------------------------
-
-- perform distributed testing related reporting in the plugin
-  rather than having dist-related code in the generic py.test
-  distribution
-
-- depend on execnet-1.0.7 which adds "env1:NAME=value" keys to
-  gateway specification strings.
-
-- show detailed gateway setup and platform information only when
-  "-v" or "--verbose" is specified.
-
-1.3
--------------------------
-
-- fix --looponfailing - it would not actually run against the fully changed
-  source tree when initial conftest files load application state.
-
-- adapt for py-1.3.1's new --maxfailure option
-
-1.2
--------------------------
-
-- fix issue79: sessionfinish/teardown hooks are now called systematically
-  on the slave side
-- introduce a new data input/output mechanism to allow the master side
-  to send and receive data from a slave.
-- fix race condition in underlying pickling/unpickling handling
-- use and require new register hooks facility of py.test>=1.3.0
-- require improved execnet>=1.0.6 because of various race conditions
-  that can arise in xdist testing modes.
-- fix some python3 related pickling related race conditions
-- fix PyPI description
-
-1.1
--------------------------
-
-- fix an indefinite hang which would wait for events although no events
-  are pending - this happened if items arrive very quickly while
-  the "reschedule-event" tried unconditionally avoiding a busy-loop
-  and not schedule new work.
-
-1.0
--------------------------
-
-- moved code out of py-1.1.1 into its own plugin
-- use a new, faster and more sensible model to do load-balancing
-  of tests - now no magic "MAXITEMSPERHOST" is needed and load-testing
-  works effectively even with very few tests.
-- cleaned up termination handling
-- make -x cause hard killing of test nodes to decrease wait time
-  until the traceback shows up on first failure

CHANGELOG.rst

@@ -0,0 +1,775 @@
+pytest-xdist 2.2.0 (2020-12-14)
+===============================
+
+Features
+--------
+
+- `#608 <https://github.com/pytest-dev/pytest-xdist/issues/608>`_: Internal errors in workers are now propagated to the master node.
+
+
+pytest-xdist 2.1.0 (2020-08-25)
+===============================
+
+Features
+--------
+
+- `#585 <https://github.com/pytest-dev/pytest-xdist/issues/585>`_: New ``pytest_xdist_auto_num_workers`` hook can be implemented by plugins or ``conftest.py`` files to control the number of workers when ``--numprocesses=auto`` is given in the command-line.
+
+
+Trivial Changes
+---------------
+
+- `#585 <https://github.com/pytest-dev/pytest-xdist/issues/585>`_: ``psutil`` has proven to make ``pytest-xdist`` installation in certain platforms and containers problematic, so to use it for automatic number of CPUs detection users need to install the ``psutil`` extra::
+
+      pip install pytest-xdist[psutil]
+
+
+pytest-xdist 2.0.0 (2020-08-12)
+===============================
+
+Deprecations and Removals
+-------------------------
+
+- `#541 <https://github.com/pytest-dev/pytest-xdist/issues/541>`_: Drop backward-compatibility "slave" aliases related to worker nodes.  We deliberately moved away from this terminology years ago, and it seems like the right time to finish the deprecation and removal process.
+
+- `#569 <https://github.com/pytest-dev/pytest-xdist/issues/569>`_: ``pytest-xdist`` no longer supports Python 2.7.
+
+
+Features
+--------
+
+- `#504 <https://github.com/pytest-dev/pytest-xdist/issues/504>`_: New functions ``xdist.is_xdist_worker``, ``xdist.is_xdist_master``, ``xdist.get_xdist_worker_id``, to easily identify the current node.
+
+
+Bug Fixes
+---------
+
+- `#471 <https://github.com/pytest-dev/pytest-xdist/issues/471>`_: Fix issue with Rsync reporting in quiet mode.
+
+- `#553 <https://github.com/pytest-dev/pytest-xdist/issues/553>`_: When using ``-n auto``, count the number of physical CPU cores instead of logical ones.
+
+
+Trivial Changes
+---------------
+
+- `#541 <https://github.com/pytest-dev/pytest-xdist/issues/541>`_: ``pytest-xdist`` now requires ``pytest>=6.0``.
+
+
+pytest-xdist 1.34.0 (2020-07-27)
+================================
+
+Features
+--------
+
+- `#549 <https://github.com/pytest-dev/pytest-xdist/issues/549>`_: Make ``--pdb`` imply ``--dist no``, as the two options cannot really work together at the moment.
+
+
+Bug Fixes
+---------
+
+- `#478 <https://github.com/pytest-dev/pytest-xdist/issues/478>`_: Fix regression with duplicated arguments via $PYTEST_ADDOPTS in 1.30.0.
+
+- `#558 <https://github.com/pytest-dev/pytest-xdist/issues/558>`_: Fix ``rsyncdirs`` usage with pytest 6.0.
+
+- `#562 <https://github.com/pytest-dev/pytest-xdist/issues/562>`_: Do not trigger the deprecated ``pytest_warning_captured`` in pytest 6.0+.
+
+
+pytest-xdist 1.33.0 (2020-07-09)
+================================
+
+Features
+--------
+
+- `#554 <https://github.com/pytest-dev/pytest-xdist/issues/554>`_: Fix warnings support for upcoming pytest 6.0.
+
+
+Trivial Changes
+---------------
+
+- `#548 <https://github.com/pytest-dev/pytest-xdist/issues/548>`_: SCM and CI files are no longer included in the source distribution.
+
+
+pytest-xdist 1.32.0 (2020-05-03)
+================================
+
+Deprecations and Removals
+-------------------------
+
+- `#475 <https://github.com/pytest-dev/pytest-xdist/issues/475>`_: Drop support for EOL Python 3.4.
+
+
+Features
+--------
+
+- `#524 <https://github.com/pytest-dev/pytest-xdist/issues/524>`_: Add `testrun_uid` fixture. This is a shared value that uniquely identifies a test run among all workers.
+  This also adds a `PYTEST_XDIST_TESTRUNUID` environment variable that is accessible within a test as well as a command line option `--testrunuid` to manually set the value from outside.
+
+
+pytest-xdist 1.31.0 (2019-12-19)
+================================
+
+Features
+--------
+
+- `#486 <https://github.com/pytest-dev/pytest-xdist/issues/486>`_: Add support for Python 3.8.
+
+
+Bug Fixes
+---------
+
+- `#491 <https://github.com/pytest-dev/pytest-xdist/issues/491>`_: Fix regression that caused custom plugin command-line arguments to be discarded when using ``--tx`` mode.
+
+
+
+pytest-xdist 1.30.0 (2019-10-01)
+================================
+
+Features
+--------
+
+- `#448 <https://github.com/pytest-dev/pytest-xdist/issues/448>`_: Initialization between workers and master nodes is now more consistent, which fixes a number of
+  long-standing issues related to startup with the ``-c`` option.
+
+  Issues:
+
+  * `#6 <https://github.com/pytest-dev/pytest-xdist/issues/6>`__: Poor interaction between ``-n#`` and ``-c X.cfg``
+  * `#445 <https://github.com/pytest-dev/pytest-xdist/issues/445>`__: pytest-xdist is not reporting the same nodeid as pytest does
+
+  This however only works with **pytest 5.1 or later**, as it required changes in pytest itself.
+
+
+Bug Fixes
+---------
+
+- `#467 <https://github.com/pytest-dev/pytest-xdist/issues/467>`_: Fix crash issues related to running xdist with the terminal plugin disabled.
+
+
+pytest-xdist 1.29.0 (2019-06-14)
+================================
+
+Features
+--------
+
+- `#226 <https://github.com/pytest-dev/pytest-xdist/issues/226>`_: ``--max-worker-restart`` now assumes a more reasonable value (4 times the number of
+  nodes) when not given explicitly. This prevents test suites from running forever when the suite crashes during collection.
+
+- `#435 <https://github.com/pytest-dev/pytest-xdist/issues/435>`_: When the test session is interrupted due to running out of workers, the reason is shown in the test summary
+  for easier viewing.
+
+- `#442 <https://github.com/pytest-dev/pytest-xdist/issues/442>`_: Compatibility fix for upcoming pytest 5.0: ``session.exitstatus`` is now an ``IntEnum`` object.
+
+
+Bug Fixes
+---------
+
+- `#435 <https://github.com/pytest-dev/pytest-xdist/issues/435>`_: No longer show an internal error when we run out of workers due to crashes.
+
+
+pytest-xdist 1.28.0 (2019-04-02)
+================================
+
+Features
+--------
+
+- `#426 <https://github.com/pytest-dev/pytest-xdist/issues/426>`_: ``pytest-xdist`` now uses the new ``pytest_report_to_serializable`` and ``pytest_report_from_serializable``
+  hooks from ``pytest 4.4`` (still experimental). This will make report serialization more reliable and
+  extensible.
+
+  This also means that ``pytest-xdist`` now requires ``pytest>=4.4``.
+
+
+pytest-xdist 1.27.0 (2019-02-15)
+================================
+
+Features
+--------
+
+- `#374 <https://github.com/pytest-dev/pytest-xdist/issues/374>`_: The new ``pytest_xdist_getremotemodule`` hook allows overriding the module run on remote nodes.
+
+- `#415 <https://github.com/pytest-dev/pytest-xdist/issues/415>`_: Improve behavior of ``--numprocesses=auto`` to work well with ``--pdb`` option.
+
+
+pytest-xdist 1.26.1 (2019-01-28)
+================================
+
+Bug Fixes
+---------
+
+- `#406 <https://github.com/pytest-dev/pytest-xdist/issues/406>`_: Do not implement deprecated ``pytest_logwarning`` hook in pytest versions where it is deprecated.
+
+
+pytest-xdist 1.26.0 (2019-01-11)
+================================
+
+Features
+--------
+
+- `#376 <https://github.com/pytest-dev/pytest-xdist/issues/376>`_: The current directory is no longer added ``sys.path`` for local workers, only for remote connections.
+
+  This behavior is surprising because it makes xdist runs and non-xdist runs to potentially behave differently.
+
+
+Bug Fixes
+---------
+
+- `#379 <https://github.com/pytest-dev/pytest-xdist/issues/379>`_: Warning attributes are checked to make sure they can be dumped prior to
+  serializing the warning for submission to the master node.
+
+
+pytest-xdist 1.25.0 (2018-12-12)
+================================
+
+Deprecations and Removals
+-------------------------
+
+- `#372 <https://github.com/pytest-dev/pytest-xdist/issues/372>`_: Pytest versions older than 3.6 are no longer supported.
+
+
+Features
+--------
+
+- `#373 <https://github.com/pytest-dev/pytest-xdist/issues/373>`_: Node setup information is hidden when pytest is run in quiet mode to reduce noise on many-core machines.
+
+- `#388 <https://github.com/pytest-dev/pytest-xdist/issues/388>`_: ``mainargv`` is made available in ``workerinput`` from the host's ``sys.argv``.
+
+  This can be used via ``request.config.workerinput["mainargv"]``.
+
+
+Bug Fixes
+---------
+
+- `#332 <https://github.com/pytest-dev/pytest-xdist/issues/332>`_: Fix report of module-level skips (``pytest.skip(reason, allow_module_level=True)``).
+
+- `#378 <https://github.com/pytest-dev/pytest-xdist/issues/378>`_: Fix support for gevent monkeypatching
+
+- `#384 <https://github.com/pytest-dev/pytest-xdist/issues/384>`_: pytest 4.1 support: ``ExceptionInfo`` API changes.
+
+- `#390 <https://github.com/pytest-dev/pytest-xdist/issues/390>`_: pytest 4.1 support: ``pytest_logwarning`` hook removed.
+
+
+pytest-xdist 1.24.1 (2018-11-09)
+================================
+
+Bug Fixes
+---------
+
+- `#349 <https://github.com/pytest-dev/pytest-xdist/issues/349>`_: Correctly handle warnings created with arguments that can't be serialized during the transfer from workers to master node.
+
+
+pytest-xdist 1.24.0 (2018-10-18)
+================================
+
+Features
+--------
+
+- `#337 <https://github.com/pytest-dev/pytest-xdist/issues/337>`_: New ``--maxprocesses`` command-line option that limits the maximum number of workers when using ``--numprocesses=auto``.
+
+
+Bug Fixes
+---------
+
+- `#351 <https://github.com/pytest-dev/pytest-xdist/issues/351>`_: Fix scheduling deadlock in case of inter-test locking.
+
+
+pytest-xdist 1.23.2 (2018-09-28)
+================================
+
+Bug Fixes
+---------
+
+- `#344 <https://github.com/pytest-dev/pytest-xdist/issues/344>`_: Fix issue where Warnings could cause pytest to fail if they do not set the args attribute correctly.
+
+
+pytest-xdist 1.23.1 (2018-09-25)
+================================
+
+Bug Fixes
+---------
+
+- `#341 <https://github.com/pytest-dev/pytest-xdist/issues/341>`_: Fix warnings transfer between workers and master node with pytest >= 3.8.
+
+
+pytest-xdist 1.23.0 (2018-08-23)
+================================
+
+Features
+--------
+
+- `#330 <https://github.com/pytest-dev/pytest-xdist/issues/330>`_: Improve collection performance by reducing the number of events sent to ``master`` node.
+
+
+pytest-xdist 1.22.5 (2018-07-27)
+================================
+
+Bug Fixes
+---------
+
+- `#321 <https://github.com/pytest-dev/pytest-xdist/issues/321>`_: Revert change that dropped support for ``pytest<3.4`` and require ``six``.
+
+  This change caused problems in some installations, and was a mistaken
+  in the first place as we should not change version requirements
+  in bug-fix releases unless they fix an actual bug.
+
+
+pytest-xdist 1.22.4 (2018-07-27)
+================================
+
+Bug Fixes
+---------
+
+- `#305 <https://github.com/pytest-dev/pytest-xdist/issues/305>`_: Remove last references to obsolete ``py.code``.
+
+  Remove some unnecessary references to ``py.builtin``.
+
+- `#316 <https://github.com/pytest-dev/pytest-xdist/issues/316>`_: Workaround cpu detection on Travis CI.
+
+
+pytest-xdist 1.22.3 (2018-07-23)
+================================
+
+Bug Fixes
+---------
+
+- Fix issue of virtualized or containerized environments not reporting the number of CPUs correctly. (`#9 <https://github.com/pytest-dev/pytest-xdist/issues/9>`_)
+
+
+Trivial Changes
+---------------
+
+- Make all classes subclass from ``object`` and fix ``super()`` call in ``LoadFileScheduling``; (`#297 <https://github.com/pytest-dev/pytest-xdist/issues/297>`_)
+
+
+pytest-xdist 1.22.2 (2018-02-26)
+================================
+
+Bug Fixes
+---------
+
+- Add backward compatibility for ``slaveoutput`` attribute to
+  ``WorkerController`` instances. (`#285
+  <https://github.com/pytest-dev/pytest-xdist/issues/285>`_)
+
+
+pytest-xdist 1.22.1 (2018-02-19)
+================================
+
+Bug Fixes
+---------
+
+- Fix issue when using ``loadscope`` or ``loadfile`` where tests would fail to
+  start if the first scope had only one test. (`#257
+  <https://github.com/pytest-dev/pytest-xdist/issues/257>`_)
+
+
+Trivial Changes
+---------------
+
+- Change terminology used by ``pytest-xdist`` to *master* and *worker* in
+  arguments and messages (for example ``--max-worker-reset``). (`#234
+  <https://github.com/pytest-dev/pytest-xdist/issues/234>`_)
+
+
+pytest-xdist 1.22.0 (2018-01-11)
+================================
+
+Features
+--------
+
+- Add support for the ``pytest_runtest_logfinish`` hook which will be released
+  in pytest 3.4. (`#266
+  <https://github.com/pytest-dev/pytest-xdist/issues/266>`_)
+
+
+pytest-xdist 1.21.0 (2017-12-22)
+================================
+
+Deprecations and Removals
+-------------------------
+
+- Drop support for EOL Python 2.6. (`#259
+  <https://github.com/pytest-dev/pytest-xdist/issues/259>`_)
+
+
+Features
+--------
+
+- New ``--dist=loadfile`` option which load-distributes test to workers grouped
+  by the file the tests live in. (`#242
+  <https://github.com/pytest-dev/pytest-xdist/issues/242>`_)
+
+
+Bug Fixes
+---------
+
+- Fix accidental mutation of test report during serialization causing longrepr
+  string-ification to break. (`#241
+  <https://github.com/pytest-dev/pytest-xdist/issues/241>`_)
+
+
+pytest-xdist 1.20.1 (2017-10-05)
+================================
+
+Bug Fixes
+---------
+
+- Fix hang when all worker nodes crash and restart limit is reached (`#45
+  <https://github.com/pytest-dev/pytest-xdist/issues/45>`_)
+
+- Fix issue where the -n option would still run distributed tests when pytest
+  was run with the --collect-only option (`#5
+  <https://github.com/pytest-dev/pytest-xdist/issues/5>`_)
+
+
+pytest-xdist 1.20.0 (2017-08-17)
+================================
+
+Features
+--------
+
+- ``xdist`` now supports tests to log results multiple times, improving
+  integration with plugins which require it like `pytest-rerunfailures
+  <https://github.com/gocept/pytest-rerunfailures>`_ and `flaky
+  <https://pypi.python.org/pypi/flaky>`_. (`#206 <https://github.com/pytest-
+  dev/pytest-xdist/issues/206>`_)
+
+
+Bug Fixes
+---------
+
+- Fix issue where tests were being incorrectly identified if a worker crashed
+  during the ``teardown`` stage of the test. (`#124 <https://github.com/pytest-
+  dev/pytest-xdist/issues/124>`_)
+
+
+pytest-xdist 1.19.1 (2017-08-10)
+================================
+
+Bug Fixes
+---------
+
+- Fix crash when transferring internal pytest warnings from workers to the
+  master node. (`#214 <https://github.com/pytest-dev/pytest-
+  xdist/issues/214>`_)
+
+
+pytest-xdist 1.19.0 (2017-08-09)
+================================
+
+Deprecations and Removals
+-------------------------
+
+- ``--boxed`` functionality has been moved to a separate plugin, `pytest-forked
+  <https://github.com/pytest-dev/pytest-forked>`_. This release now depends on
+  `` pytest-forked`` and provides ``--boxed`` as a backward compatibility
+  option. (`#1 <https://github.com/pytest-dev/pytest-xdist/issues/1>`_)
+
+
+Features
+--------
+
+- New ``--dist=loadscope`` option: sends group of related tests to the same
+  worker. Tests are grouped by module for test functions and by class for test
+  methods. See ``README.rst`` for more information. (`#191 <https://github.com
+  /pytest-dev/pytest-xdist/issues/191>`_)
+
+- Warnings are now properly transferred from workers to the master node. (`#92
+  <https://github.com/pytest-dev/pytest-xdist/issues/92>`_)
+
+
+Bug Fixes
+---------
+
+- Fix serialization of native tracebacks (``--tb=native``). (`#196
+  <https://github.com/pytest-dev/pytest-xdist/issues/196>`_)
+
+
+pytest-xdist 1.18.2 (2017-07-28)
+================================
+
+Bug Fixes
+---------
+
+- Removal of unnecessary dependency on incorrect version of py. (`#105
+  <https://github.com/pytest-dev/pytest-xdist/issues/105>`_)
+
+- Fix bug in internal event-loop error handler in the master node. This bug
+  would shadow the original errors making extremely hard/impossible for users
+  to diagnose the problem properly. (`#175 <https://github.com/pytest-
+  dev/pytest-xdist/issues/175>`_)
+
+
+pytest-xdist 1.18.1 (2017-07-05)
+================================
+
+Bug Fixes
+---------
+
+- Fixed serialization of ``longrepr.sections`` during error reporting from
+  workers. (`#171 <https://github.com/pytest-dev/pytest-xdist/issues/171>`_)
+
+- Fix ``ReprLocal`` not being unserialized breaking --showlocals usages. (`#176
+  <https://github.com/pytest-dev/pytest-xdist/issues/176>`_)
+
+
+pytest-xdist 1.18.0 (2017-06-26)
+================================
+
+- ``pytest-xdist`` now requires ``pytest>=3.0.0``.
+
+Features
+--------
+
+- Add long option `--numprocesses` as alternative for `-n`. (#168)
+
+
+Bug Fixes
+---------
+
+- Fix serialization and deserialization dropping longrepr details. (#133)
+
+
+pytest-xdist 1.17.1 (2017-06-10)
+================================
+
+Bug Fixes
+---------
+
+- Hot fix release reverting the change introduced by #124, unfortunately it
+  broke a number of test suites so we are reversing this change while we
+  investigate the problem. (#157)
+
+
+Improved Documentation
+----------------------
+
+- Introduced ``towncrier`` for ``CHANGELOG`` management. (#154)
+
+- Added ``HOWTORELEASE`` documentation. (#155)
+
+
+1.17.0
+------
+
+- fix #124: xdist would mark test as complete after 'call' step. As a result,
+  xdist could identify the wrong test as failing when test crashes at teardown.
+  To address this issue, xdist now marks test as complete at teardown.
+
+1.16.0
+------
+
+- ``pytest-xdist`` now requires pytest 2.7 or later.
+
+- Add ``worker_id`` attribute in the TestReport
+
+- new hook: ``pytest_xdist_make_scheduler(config, log)``, can return custom tests items
+  distribution logic implementation. You can take a look at built-in ``LoadScheduling``
+  and ``EachScheduling`` implementations. Note that required scheduler class public
+  API may change in next ``pytest-xdist`` versions.
+
+1.15.0
+------
+
+- new ``worker_id`` fixture, returns the id of the worker in a test or fixture.
+  Thanks Jared Hellman for the PR.
+
+- display progress during collection only when in a terminal, similar to pytest #1397 issue.
+  Thanks Bruno Oliveira for the PR.
+
+- fix internal error message when ``--maxfail`` is used (#62, #65).
+  Thanks Collin RM Stocks and Bryan A. Jones for reports and Bruno Oliveira for the PR.
+
+
+1.14
+----
+
+- new hook: ``pytest_xdist_node_collection_finished(node, ids)``, called when
+  a worker has finished collection. Thanks Omer Katz for the request and
+  Bruno Oliveira for the PR.
+
+- fix README display on pypi
+
+- fix #22: xdist now works if the internal tmpdir plugin is disabled.
+  Thanks Bruno Oliveira for the PR.
+
+- fix #32: xdist now works if looponfail or boxed are disabled.
+  Thanks Bruno Oliveira for the PR.
+
+
+1.13.1
+-------
+
+- fix a regression -n 0 now disables xdist again
+
+
+1.13
+-------------------------
+
+- extended the tox matrix with the supported py.test versions
+
+- split up the plugin into 3 plugin's
+  to prepare the departure of boxed and looponfail.
+
+  looponfail will be a part of core
+  and forked boxed will be replaced
+  with a more reliable primitive based on xdist
+
+- conforming with new pytest-2.8 behavior of returning non-zero when all
+  tests were skipped or deselected.
+
+- new "--max-slave-restart" option that can be used to control maximum
+  number of times pytest-xdist can restart slaves due to crashes. Thanks to
+  Anatoly Bubenkov for the report and Bruno Oliveira for the PR.
+
+- release as wheel
+
+- "-n" option now can be set to "auto" for automatic detection of number
+  of cpus in the host system. Thanks Suloev Dmitry for the PR.
+
+1.12
+-------------------------
+
+- fix issue594: properly report errors when the test collection
+  is random.  Thanks Bruno Oliveira.
+
+- some internal test suite adaptation (to become forward
+  compatible with the upcoming pytest-2.8)
+
+
+1.11
+-------------------------
+
+- fix pytest/xdist issue485 (also depends on py-1.4.22):
+  attach stdout/stderr on --boxed processes that die.
+
+- fix pytest/xdist issue503: make sure that a node has usually
+  two items to execute to avoid scoped fixtures to be torn down
+  pre-maturely (fixture teardown/setup is "nextitem" sensitive).
+  Thanks to Andreas Pelme for bug analysis and failing test.
+
+- restart crashed nodes by internally refactoring setup handling
+  of nodes.  Also includes better code documentation.
+  Many thanks to Floris Bruynooghe for the complete PR.
+
+
+1.10
+-------------------------
+
+- add glob support for rsyncignores, add command line option to pass
+  additional rsyncignores. Thanks Anatoly Bubenkov.
+
+- fix pytest issue382 - produce "pytest_runtest_logstart" event again
+  in master. Thanks Aron Curzon.
+
+- fix pytest issue419 by sending/receiving indices into the test
+  collection instead of node ids (which are not necessarily unique
+  for functions parametrized with duplicate values)
+
+- send multiple "to test" indices in one network message to a slave
+  and improve heuristics for sending chunks where the chunksize
+  depends on the number of remaining tests rather than fixed numbers.
+  This reduces the number of master -> node messages (but not the
+  reverse direction)
+
+
+1.9
+-------------------------
+
+- changed LICENSE to MIT
+
+- fix duplicate reported test ids with --looponfailing
+  (thanks Jeremy Thurgood)
+
+- fix pytest issue41: re-run tests on all file changes, not just
+  randomly select ones like .py/.c.
+
+- fix pytest issue347: slaves running on top of Python3.2
+  will set PYTHONDONTWRITEYBTECODE to 1 to avoid import concurrency
+  bugs.
+
+1.8
+-------------------------
+
+- fix pytest-issue93 - use the refined pytest-2.2.1 runtestprotocol
+  interface to perform eager teardowns for test items.
+
+1.7
+-------------------------
+
+- fix incompatibilities with pytest-2.2.0 (allow multiple
+  pytest_runtest_logreport reports for a test item)
+
+1.6
+-------------------------
+
+- terser collection reporting
+
+- fix issue34 - distributed testing with -p plugin now works correctly
+
+- fix race condition in looponfail mode where a concurrent file removal
+  could cause a crash
+
+1.5
+-------------------------
+
+- adapt to and require pytest-2.0 changes, rsyncdirs and rsyncignore can now
+  only be specified in [pytest] sections of ini files, see "py.test -h"
+  for details.
+- major internal refactoring to match the pytest-2.0 event refactoring
+  - perform test collection always at slave side instead of at the master
+  - make python2/python3 bridging work, remove usage of pickling
+- improve initial reporting by using line-rewriting
+- remove all trailing whitespace from source
+
+1.4
+-------------------------
+
+- perform distributed testing related reporting in the plugin
+  rather than having dist-related code in the generic py.test
+  distribution
+
+- depend on execnet-1.0.7 which adds "env1:NAME=value" keys to
+  gateway specification strings.
+
+- show detailed gateway setup and platform information only when
+  "-v" or "--verbose" is specified.
+
+1.3
+-------------------------
+
+- fix --looponfailing - it would not actually run against the fully changed
+  source tree when initial conftest files load application state.
+
+- adapt for py-1.3.1's new --maxfailure option
+
+1.2
+-------------------------
+
+- fix issue79: sessionfinish/teardown hooks are now called systematically
+  on the slave side
+- introduce a new data input/output mechanism to allow the master side
+  to send and receive data from a slave.
+- fix race condition in underlying pickling/unpickling handling
+- use and require new register hooks facility of py.test>=1.3.0
+- require improved execnet>=1.0.6 because of various race conditions
+  that can arise in xdist testing modes.
+- fix some python3 related pickling related race conditions
+- fix PyPI description
+
+1.1
+-------------------------
+
+- fix an indefinite hang which would wait for events although no events
+  are pending - this happened if items arrive very quickly while
+  the "reschedule-event" tried unconditionally avoiding a busy-loop
+  and not schedule new work.
+
+1.0
+-------------------------
+
+- moved code out of py-1.1.1 into its own plugin
+- use a new, faster and more sensible model to do load-balancing
+  of tests - now no magic "MAXITEMSPERHOST" is needed and load-testing
+  works effectively even with very few tests.
+- cleaned up termination handling
+- make -x cause hard killing of test nodes to decrease wait time
+  until the traceback shows up on first failure

ISSUES.txt

@@ -1,31 +0,0 @@
-next release critical
------------------------------------------------
-tag: bug
-
-miserably fails: --dist=each --tx popen --tx socket=...
-
-
-rename / hooks
------------------------------------------------
-tag: bug
-
-node -> slave
-transition for hooks?
-configure_node -> configure_slave
-
-allow to remotely run xdist tests with xdist
------------------------------------------------
-tag: feature
-
-allow to run xdist own tests using its own mechanism.
-currently this doesn't work because the remote side
-has no py.test plugin.   How to configure/do
-register "xdist.plugin" on the remote side?
-
-see to avoid any "from _pytest" internal imports
------------------------------------------------
-tag: feature
-
-currently tests and even xdist core code imports
-names from the internal _pytest namespace.
-See to avoid it.

LICENSE

@@ -5,10 +5,10 @@
   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   copies of the Software, and to permit persons to whom the Software is
   furnished to do so, subject to the following conditions:
-     
+
   The above copyright notice and this permission notice shall be included in all
   copies or substantial portions of the Software.
- 
+
   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
@@ -16,4 +16,3 @@
   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
   SOFTWARE.
-

MANIFEST.in

@@ -1,7 +1,5 @@
-include CHANGELOG
+exclude .appveyor.yml
-include LICENSE 
+exclude .gitignore
-include README.txt
+exclude .pre-commit-config.yaml
-include setup.py
+exclude .travis.yml
-include tox.ini
+prune .github
-graft testing
-prune .hg 

OVERVIEW.md

@@ -1,76 +1,76 @@
 # Overview #
 
 `xdist` works by spawning one or more **workers**, which are controlled
-by the **master**. Each **worker** is responsible for performing 
+by the **master**. Each **worker** is responsible for performing
 a full test collection and afterwards running tests as dictated by the **master**.
 
 The execution flow is:
 
 1. **master** spawns one or more **workers** at the beginning of
-   the test session. The communication between **master** and **worker** nodes makes use of 
+   the test session. The communication between **master** and **worker** nodes makes use of
    [execnet](http://codespeak.net/execnet/) and its [gateways](http://codespeak.net/execnet/basics.html#gateways-bootstrapping-python-interpreters).
    The actual interpreters executing the code for the **workers** might
-   be remote or local. 
+   be remote or local.
-  
+
 1. Each **worker** itself is a mini pytest runner. **workers** at this
-   point perform a full test collection, sending back the collected 
+   point perform a full test collection, sending back the collected
    test-ids back to the **master** which does not
    perform any collection itself.
-     
+
 1. The **master** receives the result of the collection from all nodes.
    At this point the **master** performs some sanity check to ensure that
    all **workers** collected the same tests (including order), bailing out otherwise.
    If all is well, it converts the list of test-ids into a list of simple
    indexes, where each index corresponds to the position of that test in the
-   original collection list. This works because all nodes have the same 
+   original collection list. This works because all nodes have the same
    collection list, and saves bandwidth because the **master** can now tell
    one of the workers to just *execute test index 3* index of passing the
    full test id.
-   
+
 1. If **dist-mode** is **each**: the **master** just sends the full list
    of test indexes to each node at this moment.
-   
+
 1. If **dist-mode** is **load**: the **master** takes around 25% of the
    tests and sends them one by one to each **worker** in a round robin
    fashion. The rest of the tests will be distributed later as **workers**
    finish tests (see below).
-   
+
+1. Note that `pytest_xdist_make_scheduler` hook can be used to implement custom tests distribution logic.
+
 1. **workers** re-implement `pytest_runtestloop`: pytest's default implementation
    basically loops over all collected items in the `session` object and executes
-   the `pytest_runtest_protocol` for each test item, but in xdist **workers** sit idly 
+   the `pytest_runtest_protocol` for each test item, but in xdist **workers** sit idly
    waiting for **master** to send tests for execution. As tests are
-   received by **workers**, `pytest_runtest_protocol` is executed for each test. 
+   received by **workers**, `pytest_runtest_protocol` is executed for each test.
-   Here it worth noting an implementation detail: **workers** always must keep at 
+   Here it worth noting an implementation detail: **workers** always must keep at
-   least one test item on their queue due to how the `pytest_runtest_protocol(item, nextitem)` 
+   least one test item on their queue due to how the `pytest_runtest_protocol(item, nextitem)`
-   hook is defined: in order to pass the `nextitem` to the hook, the worker must wait for more 
+   hook is defined: in order to pass the `nextitem` to the hook, the worker must wait for more
-   instructions from master before executing that remaining test. If it receives more tests, 
+   instructions from master before executing that remaining test. If it receives more tests,
-   then it can safely call `pytest_runtest_protocol` because it knows what the `nextitem` parameter will be. 
+   then it can safely call `pytest_runtest_protocol` because it knows what the `nextitem` parameter will be.
-   If it receives a "shutdown" signal, then it can execute the hook passing `nextitem` as `None`. 
+   If it receives a "shutdown" signal, then it can execute the hook passing `nextitem` as `None`.
-   
+
 1. As tests are started and completed at the **workers**, the results are sent
-   back to the **master**, which then just forwards the results to 
+   back to the **master**, which then just forwards the results to
-   the appropriate pytest hooks: `pytest_runtest_logstart` and 
+   the appropriate pytest hooks: `pytest_runtest_logstart` and
    `pytest_runtest_logreport`. This way other plugins (for example `junitxml`)
-   can work normally. The **master** (when in dist-mode **load**) 
+   can work normally. The **master** (when in dist-mode **load**)
    decides to send more tests to a node when a test completes, using
    some heuristics such as test durations and how many tests each **worker**
    still has to run.
-   
+
 1. When the **master** has no more pending tests it will
-   send a "shutdown" signal to all **workers**, which will then run their 
+   send a "shutdown" signal to all **workers**, which will then run their
-   remaining tests to completion and shut down. At this point the 
+   remaining tests to completion and shut down. At this point the
    **master** will sit waiting for **workers** to shut down, still
    processing events such as `pytest_runtest_logreport`.
- 
+
 ## FAQ ##
 
-> Why does each worker do its own collection, as opposed to having 
+> Why does each worker do its own collection, as opposed to having
 the master collect once and distribute from that collection to the workers?
 
-If collection was performed by master then it would have to 
+If collection was performed by master then it would have to
-serialize collected items to send them through the wire, as workers live in another process. 
+serialize collected items to send them through the wire, as workers live in another process.
-The problem is that test items are not easily (impossible?) to serialize, as they contain references to 
+The problem is that test items are not easily (impossible?) to serialize, as they contain references to
-the test functions, fixture managers, config objects, etc. Even if one manages to serialize it, 
+the test functions, fixture managers, config objects, etc. Even if one manages to serialize it,
-it seems it would be very hard to get it right and easy to break by any small change in pytest. 
+it seems it would be very hard to get it right and easy to break by any small change in pytest.
-  
-

README.rst

@@ -1,91 +1,164 @@
 
-.. image:: https://travis-ci.org/pytest-dev/pytest-xdist.svg?branch=master
-    :target: https://travis-ci.org/pytest-dev/pytest-xdist
 
 .. image:: http://img.shields.io/pypi/v/pytest-xdist.svg
-   :target: https://pypi.python.org/pypi/pytest-xdist
+    :alt: PyPI version
+    :target: https://pypi.python.org/pypi/pytest-xdist
 
-.. image:: https://ci.appveyor.com/api/projects/status/56eq1a1avd4sdd7e/branch/master?svg=true
+.. image:: https://img.shields.io/conda/vn/conda-forge/pytest-xdist.svg
-    :target: https://ci.appveyor.com/project/pytestbot/pytest-xdist
+    :target: https://anaconda.org/conda-forge/pytest-xdist
+
+.. image:: https://img.shields.io/pypi/pyversions/pytest-xdist.svg
+    :alt: Python versions
+    :target: https://pypi.python.org/pypi/pytest-xdist
+
+.. image:: https://github.com/pytest-dev/pytest-xdist/workflows/build/badge.svg
+    :target: https://github.com/pytest-dev/pytest-xdist/actions
+
+.. image:: https://img.shields.io/badge/code%20style-black-000000.svg
+    :target: https://github.com/ambv/black
 
 xdist: pytest distributed testing plugin
-=========================================
+========================================
 
-The `pytest-xdist`_ plugin extends py.test with some unique
+The `pytest-xdist`_ plugin extends pytest with some unique
 test execution modes:
 
 * test run parallelization_: if you have multiple CPUs or hosts you can use
   those for a combined test run.  This allows to speed up
   development or to use special resources of `remote machines`_.
 
-* ``--boxed``: (not available on Windows) run each test in a boxed_
-  subprocess to survive ``SEGFAULTS`` or otherwise dying processes
 
 * ``--looponfail``: run your tests repeatedly in a subprocess.  After each run
-  py.test waits until a file in your project changes and then re-runs
+  pytest waits until a file in your project changes and then re-runs
   the previously failing tests.  This is repeated until all tests pass
   after which again a full run is performed.
 
 * `Multi-Platform`_ coverage: you can specify different Python interpreters
   or different platforms and run tests in parallel on all of them.
 
-Before running tests remotely, ``py.test`` efficiently "rsyncs" your
+Before running tests remotely, ``pytest`` efficiently "rsyncs" your
 program source code to the remote place.  All test results
 are reported back and displayed to your local terminal.
 You may specify different Python versions and interpreters.
 
+If you would like to know how pytest-xdist works under the covers, checkout
+`OVERVIEW <https://github.com/pytest-dev/pytest-xdist/blob/master/OVERVIEW.md>`_.
+
 
 Installation
------------------------
+------------
 
 Install the plugin with::
 
-    easy_install pytest-xdist
-
-    # or
-
     pip install pytest-xdist
 
-or use the package in develope/in-place mode with
-a checkout of the `pytest-xdist repository`_ ::
 
-    python setup.py develop
+To use ``psutil`` for detection of the number of CPUs available, install the ``psutil`` extra::
+
+    pip install pytest-xdist[psutil]
 
-Usage examples
----------------------
 
 .. _parallelization:
 
 Speed up test runs by sending tests to multiple CPUs
-+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+----------------------------------------------------
 
-To send tests to multiple CPUs, type::
+To send tests to multiple CPUs, use the ``-n`` (or ``--numprocesses``) option::
 
-    py.test -n NUM
+    pytest -n NUMCPUS
 
-Especially for longer running tests or tests requiring
+Pass ``-n auto`` to use as many processes as your computer has CPU cores. This
-a lot of IO this can lead to considerable speed ups. This option can
+can lead to considerable speed ups, especially if your test suite takes a
-also be set to ``auto`` for automatic detection of the number of CPUs.
+noticeable amount of time.
 
-If a test crashes the interpreter, pytest-xdist will automatically restart
+If a test crashes a worker, pytest-xdist will automatically restart that worker
-that slave and report the failure as usual. You can use the
+and report the test’s failure. You can use the ``--max-worker-restart`` option
-``--max-slave-restart`` option to limit the number of slaves that can
+to limit the number of worker restarts that are allowed, or disable restarting
-be restarted, or disable restarting altogether using ``--max-slave-restart=0``.
+altogether using ``--max-worker-restart 0``.
 
+By default, using ``--numprocesses`` will send pending tests to any worker that
+is available, without any guaranteed order. You can change the test
+distribution algorithm this with the ``--dist`` option. It takes these values:
+
+* ``--dist no``: The default algorithm, distributing one test at a time.
+
+* ``--dist loadscope``: Tests are grouped by **module** for *test functions*
+  and by **class** for *test methods*. Groups are distributed to available
+  workers as whole units. This guarantees that all tests in a group run in the
+  same process. This can be useful if you have expensive module-level or
+  class-level fixtures. Grouping by class takes priority over grouping by
+  module.
+
+* ``--dist loadfile``: Tests are grouped by their containing file. Groups are
+  distributed to available workers as whole units. This guarantees that all
+  tests in a file run in the same worker.
+
+Making session-scoped fixtures execute only once
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+``pytest-xdist`` is designed so that each worker process will perform its own collection and execute
+a subset of all tests. This means that tests in different processes requesting a high-level
+scoped fixture (for example ``session``) will execute the fixture code more than once, which
+breaks expectations and might be undesired in certain situations.
+
+While ``pytest-xdist`` does not have a builtin support for ensuring a session-scoped fixture is
+executed exactly once, this can be achieved by using a lock file for inter-process communication.
+
+The example below needs to execute the fixture ``session_data`` only once (because it is
+resource intensive, or needs to execute only once to define configuration options, etc), so it makes
+use of a `FileLock <https://pypi.org/project/filelock/>`_ to produce the fixture data only once
+when the first process requests the fixture, while the other processes will then read
+the data from a file.
+
+Here is the code:
+
+.. code-block:: python
+
+    import json
+
+    import pytest
+    from filelock import FileLock
+
+
+    @pytest.fixture(scope="session")
+    def session_data(tmp_path_factory, worker_id):
+        if worker_id == "master":
+            # not executing in with multiple workers, just produce the data and let
+            # pytest's fixture caching do its job
+            return produce_expensive_data()
+
+        # get the temp directory shared by all workers
+        root_tmp_dir = tmp_path_factory.getbasetemp().parent
+
+        fn = root_tmp_dir / "data.json"
+        with FileLock(str(fn) + ".lock"):
+            if fn.is_file():
+                data = json.loads(fn.read_text())
+            else:
+                data = produce_expensive_data()
+                fn.write_text(json.dumps(data))
+        return data
+
+
+The example above can also be use in cases a fixture needs to execute exactly once per test session, like
+initializing a database service and populating initial tables.
+
+This technique might not work for every case, but should be a starting point for many situations
+where executing a high-scope fixture exactly once is important.
 
 Running tests in a Python subprocess
-+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+------------------------------------
 
-To instantiate a python2.5 sub process and send tests to it, you may type::
+To instantiate a python3.5 subprocess and send tests to it, you may type::
 
-    py.test -d --tx popen//python=python2.5
+    pytest -d --tx popen//python=python3.5
 
-This will start a subprocess which is run with the "python2.5"
+This will start a subprocess which is run with the ``python3.5``
 Python interpreter, found in your system binary lookup path.
 
 If you prefix the --tx option value like this::
 
-    --tx 3*popen//python=python2.5
+    --tx 3*popen//python=python3.5
 
 then three subprocesses would be created and tests
 will be load-balanced across these three processes.
@@ -93,38 +166,26 @@ will be load-balanced across these three processes.
 .. _boxed:
 
 Running tests in a boxed subprocess
-+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+-----------------------------------
-
-If you have tests involving C or C++ libraries you might have to deal
-with tests crashing the process.  For this case you may use the boxing
-options::
-
-    py.test --boxed
-
-which will run each test in a subprocess and will report if a test
-crashed the process.  You can also combine this option with
-running multiple processes to speed up the test run and use your CPU cores::
-
-    py.test -n3 --boxed
-
-this would run 3 testing subprocesses in parallel which each
-create new boxed subprocesses for each test.
 
+This functionality has been moved to the
+`pytest-forked <https://github.com/pytest-dev/pytest-forked>`_ plugin, but the ``--boxed`` option
+is still kept for backward compatibility.
 
 .. _`remote machines`:
 
 Sending tests to remote SSH accounts
-+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+------------------------------------
 
 Suppose you have a package ``mypkg`` which contains some
 tests that you can successfully run locally. And you
 have a ssh-reachable machine ``myhost``.  Then
 you can ad-hoc distribute your tests by typing::
 
-    py.test -d --tx ssh=myhostpopen --rsyncdir mypkg mypkg
+    pytest -d --tx ssh=myhostpopen --rsyncdir mypkg mypkg
 
 This will synchronize your :code:`mypkg` package directory
-to an remote ssh account and then locally collect tests
+to a remote ssh account and then locally collect tests
 and send them to remote places for execution.
 
 You can specify multiple :code:`--rsyncdir` directories
@@ -132,11 +193,11 @@ to be sent to the remote side.
 
 .. note::
 
-  For py.test to collect and send tests correctly
+  For pytest to collect and send tests correctly
   you not only need to make sure all code and tests
   directories are rsynced, but that any test (sub) directory
   also has an :code:`__init__.py` file because internally
-  py.test references tests as a fully qualified python
+  pytest references tests as a fully qualified python
   module path.  **You will otherwise get strange errors**
   during setup of the remote side.
 
@@ -149,7 +210,7 @@ ini-file option(s).
 
 
 Sending tests to remote Socket Servers
-+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+--------------------------------------
 
 Download the single-module `socketserver.py`_ Python program
 and run it like this::
@@ -160,7 +221,7 @@ It will tell you that it starts listening on the default
 port.  You can now on your home machine specify this
 new socket host with something like this::
 
-    py.test -d --tx socket=192.168.1.102:8888 --rsyncdir mypkg mypkg
+    pytest -d --tx socket=192.168.1.102:8888 --rsyncdir mypkg mypkg
 
 
 .. _`atonce`:
@@ -168,49 +229,153 @@ new socket host with something like this::
 
 
 Running tests on many platforms at once
-+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+---------------------------------------
 
 The basic command to run tests on multiple platforms is::
 
-    py.test --dist=each --tx=spec1 --tx=spec2
+    pytest --dist=each --tx=spec1 --tx=spec2
 
 If you specify a windows host, an OSX host and a Linux
 environment this command will send each tests to all
 platforms - and report back failures from all platforms
-at once.   The specifications strings use the `xspec syntax`_.
+at once. The specifications strings use the `xspec syntax`_.
 
 .. _`xspec syntax`: http://codespeak.net/execnet/basics.html#xspec
 
-.. _`socketserver.py`: http://bitbucket.org/hpk42/execnet/raw/2af991418160/execnet/script/socketserver.py
+.. _`socketserver.py`: https://raw.githubusercontent.com/pytest-dev/execnet/master/execnet/script/socketserver.py
 
 .. _`execnet`: http://codespeak.net/execnet
 
-Specifying test exec environments in an ini file
+Identifying the worker process during a test
-+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+--------------------------------------------
 
-pytest (since version 2.0) supports ini-style cofiguration.
+*New in version 1.15.*
-You can for example make running with three subprocesses
+
-your default like this::
+If you need to determine the identity of a worker process in
+a test or fixture, you may use the ``worker_id`` fixture to do so:
+
+.. code-block:: python
+
+    @pytest.fixture()
+    def user_account(worker_id):
+        """ use a different account in each xdist worker """
+        return "account_%s" % worker_id
+
+When ``xdist`` is disabled (running with ``-n0`` for example), then
+``worker_id`` will return ``"master"``.
+
+Worker processes also have the following environment variables
+defined:
+
+* ``PYTEST_XDIST_WORKER``: the name of the worker, e.g., ``"gw2"``.
+* ``PYTEST_XDIST_WORKER_COUNT``: the total number of workers in this session,
+  e.g., ``"4"`` when ``-n 4`` is given in the command-line.
+
+The information about the worker_id in a test is stored in the ``TestReport`` as
+well, under the ``worker_id`` attribute.
+
+Since version 2.0, the following functions are also available in the ``xdist`` module:
+
+.. code-block:: python
+
+    def is_xdist_worker(request_or_session) -> bool:
+        """Return `True` if this is an xdist worker, `False` otherwise
+
+        :param request_or_session: the `pytest` `request` or `session` object
+        """
+
+    def is_xdist_master(request_or_session) -> bool:
+        """Return `True` if this is the xdist master, `False` otherwise
+
+        Note: this method also returns `False` when distribution has not been
+        activated at all.
+
+        :param request_or_session: the `pytest` `request` or `session` object
+        """
+
+    def get_xdist_worker_id(request_or_session) -> str:
+        """Return the id of the current worker ('gw0', 'gw1', etc) or 'master'
+        if running on the 'master' node.
+
+        If not distributing tests (for example passing `-n0` or not passing `-n` at all) also return 'master'.
+
+        :param request_or_session: the `pytest` `request` or `session` object
+        """
+
+
+Uniquely identifying the current test run
+-----------------------------------------
+
+*New in version 1.32.*
+
+If you need to globally distinguish one test run from others in your
+workers, you can use the ``testrun_uid`` fixture. For instance, let's say you
+wanted to create a separate database for each test run:
+
+.. code-block:: python
+
+    import pytest
+    from posix_ipc import Semaphore, O_CREAT
+
+    @pytest.fixture(scope="session", autouse=True)
+    def create_unique_database(testrun_uid):
+        """ create a unique database for this particular test run """
+        database_url = f"psql://myapp-{testrun_uid}"
+
+        with Semaphore(f"/{testrun_uid}-lock", flags=O_CREAT, initial_value=1):
+            if not database_exists(database_url):
+                create_database(database_url)
+
+    @pytest.fixture()
+    def db(testrun_uid):
+        """ retrieve unique database """
+        database_url = f"psql://myapp-{testrun_uid}"
+        return database_get_instance(database_url)
+
+
+Additionally, during a test run, the following environment variable is defined:
+
+* ``PYTEST_XDIST_TESTRUNUID``: the unique id of the test run.
+
+Accessing ``sys.argv`` from the master node in workers
+------------------------------------------------------
+
+To access the ``sys.argv`` passed to the command-line of the master node, use
+``request.config.workerinput["mainargv"]``.
+
+
+Specifying test exec environments in an ini file
+------------------------------------------------
+
+You can use pytest's ini file configuration to avoid typing common options.
+You can for example make running with three subprocesses your default like this:
+
+.. code-block:: ini
 
     [pytest]
     addopts = -n3
 
-You can also add default environments like this::
+You can also add default environments like this:
+
+.. code-block:: ini
 
     [pytest]
-    addopts = --tx ssh=myhost//python=python2.5 --tx ssh=myhost//python=python2.6
+    addopts = --tx ssh=myhost//python=python3.5 --tx ssh=myhost//python=python3.6
 
 and then just type::
 
-    py.test --dist=each
+    pytest --dist=each
 
 to run tests in each of the environments.
 
+
 Specifying "rsync" dirs in an ini-file
-+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+--------------------------------------
 
 In a ``tox.ini`` or ``setup.cfg`` file in your root project directory
-you may specify directories to include or to exclude in synchronisation::
+you may specify directories to include or to exclude in synchronisation:
+
+.. code-block:: ini
 
     [pytest]
     rsyncdirs = . mypkg helperpkg
@@ -222,9 +387,3 @@ where the configuration file was found.
 .. _`pytest-xdist`: http://pypi.python.org/pypi/pytest-xdist
 .. _`pytest-xdist repository`: https://github.com/pytest-dev/pytest-xdist
 .. _`pytest`: http://pytest.org
-
-Issue and Bug Tracker
-------------------------
-
-Please use the `pytest issue tracker <https://github.com/pytest-dev/pytest/issues>`_
-for reporting bugs in this plugin.

RELEASING.rst

@@ -0,0 +1,43 @@
+======================
+Releasing pytest-xdist
+======================
+
+This document describes the steps to make a new ``pytest-xdist`` release.
+
+Version
+-------
+
+``master`` should always be green and a potential release candidate. ``pytest-xdist`` follows
+semantic versioning, so given that the current version is ``X.Y.Z``, to find the next version number
+one needs to look at the ``changelog`` folder:
+
+- If there is any file named ``*.feature``, then we must make a new **minor** release: next
+  release will be ``X.Y+1.0``.
+
+- Otherwise it is just a **bug fix** release: ``X.Y.Z+1``.
+
+
+Steps
+-----
+
+To publish a new release ``X.Y.Z``, the steps are as follows:
+
+#. Create a new branch named ``release-X.Y.Z`` from the latest ``master``.
+
+#. Install ``tox`` in a virtualenv::
+
+    $ pip install tox
+
+#. Update the necessary files with::
+
+    $ tox -e release -- X.Y.Z
+
+#. Commit and push the branch for review.
+
+#. Once PR is **green** and **approved**, create and push a tag::
+
+    $ export VERSION=X.Y.Z
+    $ git tag v$VERSION release-$VERSION
+    $ git push git@github.com:pytest-dev/pytest-xdist.git v$VERSION
+
+That will build the package and publish it on ``PyPI`` automatically.

appveyor.yml

@@ -1,17 +0,0 @@
-environment:
-  matrix:
-    - PYTHON: "C:\\Python35"
-      TESTENV: "py35"
-
-    - PYTHON: "C:\\Python27"
-      TESTENV: "py27"
-
-install:
-  - "SET PATH=%PYTHON%;%PYTHON%\\Scripts;%PATH%"
-  - pip install tox setuptools_scm"
-
-build: false  # Not a C# project, build stuff at the test step instead.
-
-test_script:
-  # Build the compiled extension and run the project tests
-  - tox -e %TESTENV%-pytest27,%TESTENV%-pytest28,readme,flakes

changelog/_template.rst

@@ -0,0 +1,38 @@
+{% for section in sections %}
+{% set underline = "-" %}
+{% if section %}
+{{section}}
+{{ underline * section|length }}{% set underline = "~" %}
+
+{% endif %}
+{% if sections[section] %}
+{% for category, val in definitions.items() if category in sections[section] %}
+
+{{ definitions[category]['name'] }}
+{{ underline * definitions[category]['name']|length }}
+
+{% if definitions[category]['showcontent'] %}
+{% for text, values in sections[section][category]|dictsort(by='value') %}
+- `{{ values[0] }} <https://github.com/pytest-dev/pytest-xdist/issues/{{ values[0][1:] }}>`_: {{ text }}
+
+{% endfor %}
+{% else %}
+- {{ sections[section][category]['']|sort|join(', ') }}
+
+
+{% endif %}
+{% if sections[section][category]|length == 0 %}
+
+No significant changes.
+
+
+{% else %}
+{% endif %}
+{% endfor %}
+{% else %}
+
+No significant changes.
+
+
+{% endif %}
+{% endfor %}

example/boxed.txt

@@ -1,3 +1,9 @@
+.. note::
+
+  Since 1.19.0, the actual implementation of the ``--boxed`` option has been moved to a
+  separate plugin, `pytest-forked <https://github.com/pytest-dev/pytest-forked>`_
+  which can be installed independently. The ``--boxed`` command-line options remains
+  for backward compatibility reasons.
 
 
 If your testing involves C or C++ libraries you might have to deal
@@ -14,19 +20,19 @@ to run each test in a controlled subprocess.  Here is a basic example::
     @pytest.mark.parametrize("arg", range(50))
     def test_func(arg):
         time.sleep(0.05) # each tests takes a while
-        if arg % 19 == 0: 
+        if arg % 19 == 0:
             os.kill(os.getpid(), 15)
 
 If you run this with::
 
-    $ py.test --boxed
+    $ pytest -n1
     =========================== test session starts ============================
     platform linux2 -- Python 2.7.3 -- pytest-2.3.0.dev8
     plugins: xdist, bugzilla, cache, oejskit, cli, pep8, cov
     collecting ... collected 50 items
-    
+
     test_module.py f..................f..................f...........
-    
+
     ================================= FAILURES =================================
     _______________________________ test_func[0] _______________________________
     /home/hpk/tmp/doc-exec-420/test_module.py:6: running the test CRASHED with signal 15
@@ -40,13 +46,13 @@ You'll see that a couple of tests are reported as crashing, indicated
 by lower-case ``f`` and the respective failure summary. You can also use
 the xdist-provided parallelization feature to speed up your testing::
 
-    $ py.test --boxed -n3
+    $ pytest -n3
     =========================== test session starts ============================
     platform linux2 -- Python 2.7.3 -- pytest-2.3.0.dev8
     plugins: xdist, bugzilla, cache, oejskit, cli, pep8, cov
     gw0 I / gw1 I / gw2 I
     gw0 [50] / gw1 [50] / gw2 [50]
-    
+
     scheduling tests via LoadScheduling
     ..f...............f..................f............
     ================================= FAILURES =================================

example/loadscope/epsilon/__init__.py

@@ -0,0 +1,37 @@
+def epsilon1(arg1, arg2=1000):
+    """Do epsilon1
+
+    Usage:
+
+    >>> epsilon1(10, 20)
+    40
+    >>> epsilon1(30)
+    1040
+    """
+    return arg1 + arg2 + 10
+
+
+def epsilon2(arg1, arg2=1000):
+    """Do epsilon2
+
+    Usage:
+
+    >>> epsilon2(10, 20)
+    -20
+    >>> epsilon2(30)
+    -980
+    """
+    return arg1 - arg2 - 10
+
+
+def epsilon3(arg1, arg2=1000):
+    """Do epsilon3
+
+    Usage:
+
+    >>> epsilon3(10, 20)
+    200
+    >>> epsilon3(30)
+    30000
+    """
+    return arg1 * arg2

example/loadscope/requirements.txt

@@ -0,0 +1,3 @@
+ipdb
+pytest
+../../

example/loadscope/test/test_alpha.py

@@ -0,0 +1,51 @@
+from time import sleep
+
+
+def test_alpha0():
+    sleep(5)
+    assert True
+
+
+def test_alpha1():
+    sleep(5)
+    assert True
+
+
+def test_alpha2():
+    sleep(5)
+    assert True
+
+
+def test_alpha3():
+    sleep(5)
+    assert True
+
+
+def test_alpha4():
+    sleep(5)
+    assert True
+
+
+def test_alpha5():
+    sleep(5)
+    assert True
+
+
+def test_alpha6():
+    sleep(5)
+    assert True
+
+
+def test_alpha7():
+    sleep(5)
+    assert True
+
+
+def test_alpha8():
+    sleep(5)
+    assert True
+
+
+def test_alpha9():
+    sleep(5)
+    assert True

example/loadscope/test/test_beta.py

@@ -0,0 +1,51 @@
+from time import sleep
+
+
+def test_beta0():
+    sleep(5)
+    assert True
+
+
+def test_beta1():
+    sleep(5)
+    assert True
+
+
+def test_beta2():
+    sleep(5)
+    assert True
+
+
+def test_beta3():
+    sleep(5)
+    assert True
+
+
+def test_beta4():
+    sleep(5)
+    assert True
+
+
+def test_beta5():
+    sleep(5)
+    assert True
+
+
+def test_beta6():
+    sleep(5)
+    assert True
+
+
+def test_beta7():
+    sleep(5)
+    assert True
+
+
+def test_beta8():
+    sleep(5)
+    assert True
+
+
+def test_beta9():
+    sleep(5)
+    assert True

example/loadscope/test/test_delta.py

@@ -0,0 +1,86 @@
+from time import sleep
+from unittest import TestCase
+
+
+class Delta1(TestCase):
+    def test_delta0(self):
+        sleep(5)
+        assert True
+
+    def test_delta1(self):
+        sleep(5)
+        assert True
+
+    def test_delta2(self):
+        sleep(5)
+        assert True
+
+    def test_delta3(self):
+        sleep(5)
+        assert True
+
+    def test_delta4(self):
+        sleep(5)
+        assert True
+
+    def test_delta5(self):
+        sleep(5)
+        assert True
+
+    def test_delta6(self):
+        sleep(5)
+        assert True
+
+    def test_delta7(self):
+        sleep(5)
+        assert True
+
+    def test_delta8(self):
+        sleep(5)
+        assert True
+
+    def test_delta9(self):
+        sleep(5)
+        assert True
+
+
+class Delta2(TestCase):
+    def test_delta0(self):
+        sleep(5)
+        assert True
+
+    def test_delta1(self):
+        sleep(5)
+        assert True
+
+    def test_delta2(self):
+        sleep(5)
+        assert True
+
+    def test_delta3(self):
+        sleep(5)
+        assert True
+
+    def test_delta4(self):
+        sleep(5)
+        assert True
+
+    def test_delta5(self):
+        sleep(5)
+        assert True
+
+    def test_delta6(self):
+        sleep(5)
+        assert True
+
+    def test_delta7(self):
+        sleep(5)
+        assert True
+
+    def test_delta8(self):
+        sleep(5)
+        assert True
+
+    def test_delta9(self):
+        sleep(5)
+        assert True

example/loadscope/test/test_gamma.py

@@ -0,0 +1,51 @@
+from time import sleep
+
+
+def test_gamma0():
+    sleep(5)
+    assert True
+
+
+def test_gamma1():
+    sleep(5)
+    assert True
+
+
+def test_gamma2():
+    sleep(5)
+    assert True
+
+
+def test_gamma3():
+    sleep(5)
+    assert True
+
+
+def test_gamma4():
+    sleep(5)
+    assert True
+
+
+def test_gamma5():
+    sleep(5)
+    assert True
+
+
+def test_gamma6():
+    sleep(5)
+    assert True
+
+
+def test_gamma7():
+    sleep(5)
+    assert True
+
+
+def test_gamma8():
+    sleep(5)
+    assert True
+
+
+def test_gamma9():
+    sleep(5)
+    assert True

example/loadscope/tox.ini

@@ -0,0 +1,17 @@
+[tox]
+envlist = test
+setupdir = {toxinidir}/../../
+
+[testenv:test]
+basepython = python3
+passenv = http_proxy https_proxy
+deps = -rrequirements.txt
+changedir = {envtmpdir}
+commands =
+    pytest -s -v \
+        --doctest-modules \
+        --junitxml=tests.xml \
+        --dist=loadscope \
+        --tx=8*popen \
+        {toxinidir}/test \
+        {toxinidir}/epsilon

pyproject.toml

@@ -0,0 +1,36 @@
+[tool.towncrier]
+package = "xdist"
+filename = "CHANGELOG.rst"
+directory = "changelog/"
+title_format = "pytest-xdist {version} ({project_date})"
+template = "changelog/_template.rst"
+
+  [[tool.towncrier.type]]
+  directory = "removal"
+  name = "Deprecations and Removals"
+  showcontent = true
+
+  [[tool.towncrier.type]]
+  directory = "feature"
+  name = "Features"
+  showcontent = true
+
+  [[tool.towncrier.type]]
+  directory = "bugfix"
+  name = "Bug Fixes"
+  showcontent = true
+
+  [[tool.towncrier.type]]
+  directory = "vendor"
+  name = "Vendored Libraries"
+  showcontent = true
+
+  [[tool.towncrier.type]]
+  directory = "doc"
+  name = "Improved Documentation"
+  showcontent = true
+
+  [[tool.towncrier.type]]
+  directory = "trivial"
+  name = "Trivial Changes"
+  showcontent = true

setup.cfg

@@ -1,2 +1,5 @@
-[bdist_wheel]
+[metadata]
-universal = 1
+license_file = LICENSE
+
+[flake8]
+max-line-length = 100

setup.py

@@ -1,38 +1,48 @@
-from setuptools import setup
+from setuptools import setup, find_packages
+
+install_requires = ["execnet>=1.1", "pytest>=6.0.0", "pytest-forked"]
+
+
+with open("README.rst") as f:
+    long_description = f.read()
 
 setup(
     name="pytest-xdist",
-    use_scm_version={'write_to': 'xdist/_version.py'},
+    use_scm_version={"write_to": "src/xdist/_version.py"},
-    description='py.test xdist plugin for distributed testing'
+    description="pytest xdist plugin for distributed testing and loop-on-failing modes",
-                ' and loop-on-failing modes',
+    long_description=long_description,
-    long_description=open('README.rst').read(),
+    license="MIT",
-    license='MIT',
+    author="holger krekel and contributors",
-    author='holger krekel and contributors',
+    author_email="pytest-dev@python.org,holger@merlinux.eu",
-    author_email='pytest-dev@python.org,holger@merlinux.eu',
+    url="https://github.com/pytest-dev/pytest-xdist",
-    url='https://github.com/pytest-dev/pytest-xdist',
+    platforms=["linux", "osx", "win32"],
-    platforms=['linux', 'osx', 'win32'],
+    packages=find_packages(where="src"),
-    packages=['xdist'],
+    package_dir={"": "src"},
+    extras_require={"testing": ["filelock"], "psutil": ["psutil>=3.0"]},
     entry_points={
-        'pytest11': [
+        "pytest11": ["xdist = xdist.plugin", "xdist.looponfail = xdist.looponfail"]
-            'xdist = xdist.plugin',
-            'xdist.looponfail = xdist.looponfail',
-            'xdist.boxed = xdist.boxed',
-        ],
     },
     zip_safe=False,
-    install_requires=['execnet>=1.1', 'pytest>=2.4.2', 'py>=1.4.22'],
+    python_requires=">=3.5",
-    setup_requires=['setuptools_scm'],
+    install_requires=install_requires,
+    setup_requires=["setuptools_scm"],
     classifiers=[
-        'Development Status :: 5 - Production/Stable',
+        "Development Status :: 5 - Production/Stable",
-        'Intended Audience :: Developers',
+        "Framework :: Pytest",
-        'License :: OSI Approved :: MIT License',
+        "Intended Audience :: Developers",
-        'Operating System :: POSIX',
+        "License :: OSI Approved :: MIT License",
-        'Operating System :: Microsoft :: Windows',
+        "Operating System :: POSIX",
-        'Operating System :: MacOS :: MacOS X',
+        "Operating System :: Microsoft :: Windows",
-        'Topic :: Software Development :: Testing',
+        "Operating System :: MacOS :: MacOS X",
-        'Topic :: Software Development :: Quality Assurance',
+        "Topic :: Software Development :: Testing",
-        'Topic :: Utilities',
+        "Topic :: Software Development :: Quality Assurance",
-        'Programming Language :: Python',
+        "Topic :: Utilities",
-        'Programming Language :: Python :: 3',
+        "Programming Language :: Python",
+        "Programming Language :: Python :: 3",
+        "Programming Language :: Python :: 3 :: Only",
+        "Programming Language :: Python :: 3.5",
+        "Programming Language :: Python :: 3.6",
+        "Programming Language :: Python :: 3.7",
+        "Programming Language :: Python :: 3.8",
     ],
 )

src/xdist/__init__.py

@@ -0,0 +1,4 @@
+from xdist.plugin import is_xdist_worker, is_xdist_master, get_xdist_worker_id
+from xdist._version import version as __version__
+
+__all__ = ["__version__", "is_xdist_worker", "is_xdist_master", "get_xdist_worker_id"]

src/xdist/dsession.py

@@ -0,0 +1,431 @@
+import py
+import pytest
+
+from xdist.workermanage import NodeManager
+from xdist.scheduler import (
+    EachScheduling,
+    LoadScheduling,
+    LoadScopeScheduling,
+    LoadFileScheduling,
+)
+
+
+from queue import Empty, Queue
+
+
+class Interrupted(KeyboardInterrupt):
+    """ signals an immediate interruption. """
+
+
+class DSession:
+    """A pytest plugin which runs a distributed test session
+
+    At the beginning of the test session this creates a NodeManager
+    instance which creates and starts all nodes.  Nodes then emit
+    events processed in the pytest_runtestloop hook using the worker_*
+    methods.
+
+    Once a node is started it will automatically start running the
+    pytest mainloop with some custom hooks.  This means a node
+    automatically starts collecting tests.  Once tests are collected
+    it will wait for instructions.
+    """
+
+    def __init__(self, config):
+        self.config = config
+        self.log = py.log.Producer("dsession")
+        if not config.option.debug:
+            py.log.setconsumer(self.log._keywords, None)
+        self.nodemanager = None
+        self.sched = None
+        self.shuttingdown = False
+        self.countfailures = 0
+        self.maxfail = config.getvalue("maxfail")
+        self.queue = Queue()
+        self._session = None
+        self._failed_collection_errors = {}
+        self._active_nodes = set()
+        self._failed_nodes_count = 0
+        self._max_worker_restart = get_default_max_worker_restart(self.config)
+        # summary message to print at the end of the session
+        self._summary_report = None
+        self.terminal = config.pluginmanager.getplugin("terminalreporter")
+        if self.terminal:
+            self.trdist = TerminalDistReporter(config)
+            config.pluginmanager.register(self.trdist, "terminaldistreporter")
+
+    @property
+    def session_finished(self):
+        """Return True if the distributed session has finished
+
+        This means all nodes have executed all test items.  This is
+        used by pytest_runtestloop to break out of its loop.
+        """
+        return bool(self.shuttingdown and not self._active_nodes)
+
+    def report_line(self, line):
+        if self.terminal and self.config.option.verbose >= 0:
+            self.terminal.write_line(line)
+
+    @pytest.mark.trylast
+    def pytest_sessionstart(self, session):
+        """Creates and starts the nodes.
+
+        The nodes are setup to put their events onto self.queue.  As
+        soon as nodes start they will emit the worker_workerready event.
+        """
+        self.nodemanager = NodeManager(self.config)
+        nodes = self.nodemanager.setup_nodes(putevent=self.queue.put)
+        self._active_nodes.update(nodes)
+        self._session = session
+
+    def pytest_sessionfinish(self, session):
+        """Shutdown all nodes."""
+        nm = getattr(self, "nodemanager", None)  # if not fully initialized
+        if nm is not None:
+            nm.teardown_nodes()
+        self._session = None
+
+    def pytest_collection(self):
+        # prohibit collection of test items in master process
+        return True
+
+    @pytest.mark.trylast
+    def pytest_xdist_make_scheduler(self, config, log):
+        dist = config.getvalue("dist")
+        schedulers = {
+            "each": EachScheduling,
+            "load": LoadScheduling,
+            "loadscope": LoadScopeScheduling,
+            "loadfile": LoadFileScheduling,
+        }
+        return schedulers[dist](config, log)
+
+    def pytest_runtestloop(self):
+        self.sched = self.config.hook.pytest_xdist_make_scheduler(
+            config=self.config, log=self.log
+        )
+        assert self.sched is not None
+
+        self.shouldstop = False
+        while not self.session_finished:
+            self.loop_once()
+            if self.shouldstop:
+                self.triggershutdown()
+                raise Interrupted(str(self.shouldstop))
+        return True
+
+    def loop_once(self):
+        """Process one callback from one of the workers."""
+        while 1:
+            if not self._active_nodes:
+                # If everything has died stop looping
+                self.triggershutdown()
+                raise RuntimeError("Unexpectedly no active workers available")
+            try:
+                eventcall = self.queue.get(timeout=2.0)
+                break
+            except Empty:
+                continue
+        callname, kwargs = eventcall
+        assert callname, kwargs
+        method = "worker_" + callname
+        call = getattr(self, method)
+        self.log("calling method", method, kwargs)
+        call(**kwargs)
+        if self.sched.tests_finished:
+            self.triggershutdown()
+
+    #
+    # callbacks for processing events from workers
+    #
+
+    def worker_workerready(self, node, workerinfo):
+        """Emitted when a node first starts up.
+
+        This adds the node to the scheduler, nodes continue with
+        collection without any further input.
+        """
+        node.workerinfo = workerinfo
+        node.workerinfo["id"] = node.gateway.id
+        node.workerinfo["spec"] = node.gateway.spec
+
+        self.config.hook.pytest_testnodeready(node=node)
+        if self.shuttingdown:
+            node.shutdown()
+        else:
+            self.sched.add_node(node)
+
+    def worker_workerfinished(self, node):
+        """Emitted when node executes its pytest_sessionfinish hook.
+
+        Removes the node from the scheduler.
+
+        The node might not be in the scheduler if it had not emitted
+        workerready before shutdown was triggered.
+        """
+        self.config.hook.pytest_testnodedown(node=node, error=None)
+        if node.workeroutput["exitstatus"] == 2:  # keyboard-interrupt
+            self.shouldstop = "{} received keyboard-interrupt".format(node)
+            self.worker_errordown(node, "keyboard-interrupt")
+            return
+        if node in self.sched.nodes:
+            crashitem = self.sched.remove_node(node)
+            assert not crashitem, (crashitem, node)
+        self._active_nodes.remove(node)
+
+    def worker_internal_error(self, node, formatted_error):
+        """
+        pytest_internalerror() was called on the worker.
+
+        pytest_internalerror() arguments are an excinfo and an excrepr, which can't
+        be serialized, so we go with a poor man's solution of raising an exception
+        here ourselves using the formatted message.
+        """
+        self._active_nodes.remove(node)
+        try:
+            assert False, formatted_error
+        except AssertionError:
+            from _pytest._code import ExceptionInfo
+
+            excinfo = ExceptionInfo.from_current()
+            excrepr = excinfo.getrepr()
+            self.config.hook.pytest_internalerror(excrepr=excrepr, excinfo=excinfo)
+
+    def worker_errordown(self, node, error):
+        """Emitted by the WorkerController when a node dies."""
+        self.config.hook.pytest_testnodedown(node=node, error=error)
+        try:
+            crashitem = self.sched.remove_node(node)
+        except KeyError:
+            pass
+        else:
+            if crashitem:
+                self.handle_crashitem(crashitem, node)
+
+        self._failed_nodes_count += 1
+        maximum_reached = (
+            self._max_worker_restart is not None
+            and self._failed_nodes_count > self._max_worker_restart
+        )
+        if maximum_reached:
+            if self._max_worker_restart == 0:
+                msg = "worker {} crashed and worker restarting disabled".format(
+                    node.gateway.id
+                )
+            else:
+                msg = "maximum crashed workers reached: %d" % self._max_worker_restart
+            self._summary_report = msg
+            self.report_line("\n" + msg)
+            self.triggershutdown()
+        else:
+            self.report_line("\nreplacing crashed worker %s" % node.gateway.id)
+            self._clone_node(node)
+        self._active_nodes.remove(node)
+
+    def pytest_terminal_summary(self, terminalreporter):
+        if self.config.option.verbose >= 0 and self._summary_report:
+            terminalreporter.write_sep("=", "xdist: {}".format(self._summary_report))
+
+    def worker_collectionfinish(self, node, ids):
+        """worker has finished test collection.
+
+        This adds the collection for this node to the scheduler.  If
+        the scheduler indicates collection is finished (i.e. all
+        initial nodes have submitted their collections), then tells the
+        scheduler to schedule the collected items.  When initiating
+        scheduling the first time it logs which scheduler is in use.
+        """
+        if self.shuttingdown:
+            return
+        self.config.hook.pytest_xdist_node_collection_finished(node=node, ids=ids)
+        # tell session which items were effectively collected otherwise
+        # the master node will finish the session with EXIT_NOTESTSCOLLECTED
+        self._session.testscollected = len(ids)
+        self.sched.add_node_collection(node, ids)
+        if self.terminal:
+            self.trdist.setstatus(node.gateway.spec, "[%d]" % (len(ids)))
+        if self.sched.collection_is_completed:
+            if self.terminal and not self.sched.has_pending:
+                self.trdist.ensure_show_status()
+                self.terminal.write_line("")
+                if self.config.option.verbose > 0:
+                    self.terminal.write_line(
+                        "scheduling tests via %s" % (self.sched.__class__.__name__)
+                    )
+            self.sched.schedule()
+
+    def worker_logstart(self, node, nodeid, location):
+        """Emitted when a node calls the pytest_runtest_logstart hook."""
+        self.config.hook.pytest_runtest_logstart(nodeid=nodeid, location=location)
+
+    def worker_logfinish(self, node, nodeid, location):
+        """Emitted when a node calls the pytest_runtest_logfinish hook."""
+        self.config.hook.pytest_runtest_logfinish(nodeid=nodeid, location=location)
+
+    def worker_testreport(self, node, rep):
+        """Emitted when a node calls the pytest_runtest_logreport hook."""
+        rep.node = node
+        self.config.hook.pytest_runtest_logreport(report=rep)
+        self._handlefailures(rep)
+
+    def worker_runtest_protocol_complete(self, node, item_index, duration):
+        """
+        Emitted when a node fires the 'runtest_protocol_complete' event,
+        signalling that a test has completed the runtestprotocol and should be
+        removed from the pending list in the scheduler.
+        """
+        self.sched.mark_test_complete(node, item_index, duration)
+
+    def worker_collectreport(self, node, rep):
+        """Emitted when a node calls the pytest_collectreport hook.
+
+        Because we only need the report when there's a failure/skip, as optimization
+        we only expect to receive failed/skipped reports from workers (#330).
+        """
+        assert not rep.passed
+        self._failed_worker_collectreport(node, rep)
+
+    def worker_warning_captured(self, warning_message, when, item):
+        """Emitted when a node calls the pytest_warning_captured hook (deprecated in 6.0)."""
+        kwargs = dict(warning_message=warning_message, when=when, item=item)
+        self.config.hook.pytest_warning_captured.call_historic(kwargs=kwargs)
+
+    def worker_warning_recorded(self, warning_message, when, nodeid, location):
+        """Emitted when a node calls the pytest_warning_recorded hook."""
+        kwargs = dict(
+            warning_message=warning_message, when=when, nodeid=nodeid, location=location
+        )
+        self.config.hook.pytest_warning_recorded.call_historic(kwargs=kwargs)
+
+    def _clone_node(self, node):
+        """Return new node based on an existing one.
+
+        This is normally for when a node dies, this will copy the spec
+        of the existing node and create a new one with a new id.  The
+        new node will have been setup so it will start calling the
+        "worker_*" hooks and do work soon.
+        """
+        spec = node.gateway.spec
+        spec.id = None
+        self.nodemanager.group.allocate_id(spec)
+        node = self.nodemanager.setup_node(spec, self.queue.put)
+        self._active_nodes.add(node)
+        return node
+
+    def _failed_worker_collectreport(self, node, rep):
+        # Check we haven't already seen this report (from
+        # another worker).
+        if rep.longrepr not in self._failed_collection_errors:
+            self._failed_collection_errors[rep.longrepr] = True
+            self.config.hook.pytest_collectreport(report=rep)
+            self._handlefailures(rep)
+
+    def _handlefailures(self, rep):
+        if rep.failed:
+            self.countfailures += 1
+            if self.maxfail and self.countfailures >= self.maxfail:
+                self.shouldstop = "stopping after %d failures" % (self.countfailures)
+
+    def triggershutdown(self):
+        self.log("triggering shutdown")
+        self.shuttingdown = True
+        for node in self.sched.nodes:
+            node.shutdown()
+
+    def handle_crashitem(self, nodeid, worker):
+        # XXX get more reporting info by recording pytest_runtest_logstart?
+        # XXX count no of failures and retry N times
+        runner = self.config.pluginmanager.getplugin("runner")
+        fspath = nodeid.split("::")[0]
+        msg = "worker {!r} crashed while running {!r}".format(worker.gateway.id, nodeid)
+        rep = runner.TestReport(
+            nodeid, (fspath, None, fspath), (), "failed", msg, "???"
+        )
+        rep.node = worker
+        self.config.hook.pytest_runtest_logreport(report=rep)
+
+
+class TerminalDistReporter:
+    def __init__(self, config):
+        self.config = config
+        self.tr = config.pluginmanager.getplugin("terminalreporter")
+        self._status = {}
+        self._lastlen = 0
+        self._isatty = getattr(self.tr, "isatty", self.tr.hasmarkup)
+
+    def write_line(self, msg):
+        self.tr.write_line(msg)
+
+    def ensure_show_status(self):
+        if not self._isatty:
+            self.write_line(self.getstatus())
+
+    def setstatus(self, spec, status, show=True):
+        self._status[spec.id] = status
+        if show and self._isatty:
+            self.rewrite(self.getstatus())
+
+    def getstatus(self):
+        if self.config.option.verbose >= 0:
+            parts = [
+                "{} {}".format(spec.id, self._status[spec.id]) for spec in self._specs
+            ]
+            return " / ".join(parts)
+        else:
+            return "bringing up nodes..."
+
+    def rewrite(self, line, newline=False):
+        pline = line + " " * max(self._lastlen - len(line), 0)
+        if newline:
+            self._lastlen = 0
+            pline += "\n"
+        else:
+            self._lastlen = len(line)
+        self.tr.rewrite(pline, bold=True)
+
+    def pytest_xdist_setupnodes(self, specs):
+        self._specs = specs
+        for spec in specs:
+            self.setstatus(spec, "I", show=False)
+        self.setstatus(spec, "I", show=True)
+        self.ensure_show_status()
+
+    def pytest_xdist_newgateway(self, gateway):
+        if self.config.option.verbose > 0:
+            rinfo = gateway._rinfo()
+            version = "%s.%s.%s" % rinfo.version_info[:3]
+            self.rewrite(
+                "[%s] %s Python %s cwd: %s"
+                % (gateway.id, rinfo.platform, version, rinfo.cwd),
+                newline=True,
+            )
+        self.setstatus(gateway.spec, "C")
+
+    def pytest_testnodeready(self, node):
+        if self.config.option.verbose > 0:
+            d = node.workerinfo
+            infoline = "[{}] Python {}".format(
+                d["id"], d["version"].replace("\n", " -- ")
+            )
+            self.rewrite(infoline, newline=True)
+        self.setstatus(node.gateway.spec, "ok")
+
+    def pytest_testnodedown(self, node, error):
+        if not error:
+            return
+        self.write_line("[{}] node down: {}".format(node.gateway.id, error))
+
+
+def get_default_max_worker_restart(config):
+    """gets the default value of --max-worker-restart option if it is not provided.
+
+    Use a reasonable default to avoid workers from restarting endlessly due to crashing collections (#226).
+    """
+    result = config.option.maxworkerrestart
+    if result is not None:
+        result = int(result)
+    elif config.option.numprocesses:
+        # if --max-worker-restart was not provided, use a reasonable default (#226)
+        result = config.option.numprocesses * 4
+    return result

src/xdist/looponfail.py

@@ -1,34 +1,37 @@
 """
-    Implement -f aka looponfailing for py.test.
+    Implement -f aka looponfailing for pytest.
 
     NOTE that we try to avoid loading and depending on application modules
     within the controlling process (the one that starts repeatedly test
     processes) otherwise changes to source code can crash
     the controlling process which should best never happen.
 """
-
 import py
 import pytest
 import sys
+import time
 import execnet
 
 
 def pytest_addoption(parser):
     group = parser.getgroup("xdist", "distributed and subprocess testing")
     group._addoption(
-        '-f', '--looponfail',
+        "-f",
-        action="store_true", dest="looponfail", default=False,
+        "--looponfail",
+        action="store_true",
+        dest="looponfail",
+        default=False,
         help="run tests in subprocess, wait for modified files "
-             "and re-run failing test set until all pass.")
+        "and re-run failing test set until all pass.",
+    )
 
 
 def pytest_cmdline_main(config):
 
     if config.getoption("looponfail"):
-        usepdb = config.getoption('usepdb')  # a core option
+        usepdb = config.getoption("usepdb", False)  # a core option
         if usepdb:
-            raise pytest.UsageError(
+            raise pytest.UsageError("--pdb is incompatible with --looponfail.")
-                "--pdb incompatible with --looponfail.")
         looponfail_main(config)
         return 2  # looponfail only can get stop with ctrl-C anyway
 
@@ -44,14 +47,14 @@ def looponfail_main(config):
                 # the last failures passed, let's immediately rerun all
                 continue
             repr_pytest_looponfailinfo(
-                failreports=remotecontrol.failures,
+                failreports=remotecontrol.failures, rootdirs=rootdirs
-                rootdirs=rootdirs)
+            )
             statrecorder.waitonchange(checkinterval=2.0)
     except KeyboardInterrupt:
         print()
 
 
-class RemoteControl(object):
+class RemoteControl:
     def __init__(self, config):
         self.config = config
         self.failures = []
@@ -59,7 +62,7 @@ class RemoteControl(object):
     def trace(self, *args):
         if self.config.option.debug:
             msg = " ".join([str(x) for x in args])
-            py.builtin.print_("RemoteControl:", msg)
+            print("RemoteControl:", msg)
 
     def initgateway(self):
         return execnet.makegateway("popen")
@@ -67,12 +70,12 @@ class RemoteControl(object):
     def setup(self, out=None):
         if out is None:
             out = py.io.TerminalWriter()
-        if hasattr(self, 'gateway'):
+        if hasattr(self, "gateway"):
             raise ValueError("already have gateway %r" % self.gateway)
-        self.trace("setting up slave session")
+        self.trace("setting up worker session")
         self.gateway = self.initgateway()
         self.channel = channel = self.gateway.remote_exec(
-            init_slave_session,
+            init_worker_session,
             args=self.config.args,
             option_dict=vars(self.config.option),
         )
@@ -81,15 +84,16 @@ class RemoteControl(object):
         def write(s):
             out._file.write(s)
             out._file.flush()
+
         remote_outchannel.setcallback(write)
 
     def ensure_teardown(self):
-        if hasattr(self, 'channel'):
+        if hasattr(self, "channel"):
             if not self.channel.isclosed():
                 self.trace("closing", self.channel)
                 self.channel.close()
             del self.channel
-        if hasattr(self, 'gateway'):
+        if hasattr(self, "gateway"):
             self.trace("exiting", self.gateway)
             self.gateway.exit()
             del self.gateway
@@ -131,14 +135,15 @@ def repr_pytest_looponfailinfo(failreports, rootdirs):
                 tr.line(report, red=True)
     tr.sep("#", "waiting for changes", bold=True)
     for rootdir in rootdirs:
-        tr.line("### Watching:   %s" % (rootdir,), bold=True)
+        tr.line("### Watching:   {}".format(rootdir), bold=True)
 
 
-def init_slave_session(channel, args, option_dict):
+def init_worker_session(channel, args, option_dict):
     import os
     import sys
+
     outchannel = channel.gateway.newchannel()
-    sys.stdout = sys.stderr = outchannel.makefile('w')
+    sys.stdout = sys.stderr = outchannel.makefile("w")
     channel.send(outchannel)
     # prune sys.path to not contain relative paths
     newpaths = []
@@ -151,13 +156,15 @@ def init_slave_session(channel, args, option_dict):
 
     # fullwidth, hasmarkup = channel.receive()
     from _pytest.config import Config
+
     config = Config.fromdictargs(option_dict, list(args))
     config.args = args
-    from xdist.looponfail import SlaveFailSession
+    from xdist.looponfail import WorkerFailSession
-    SlaveFailSession(config, channel).main()
+
+    WorkerFailSession(config, channel).main()
 
 
-class SlaveFailSession:
+class WorkerFailSession:
     def __init__(self, config, channel):
         self.config = config
         self.channel = channel
@@ -180,7 +187,8 @@ class SlaveFailSession:
         except pytest.UsageError:
             items = session.perform_collect(None)
         hook.pytest_collection_modifyitems(
-            session=session, config=session.config, items=items)
+            session=session, config=session.config, items=items
+        )
         hook.pytest_collection_finish(session=session)
         return True
 
@@ -194,11 +202,11 @@ class SlaveFailSession:
             self.collection_failed = True
 
     def main(self):
-        self.DEBUG("SLAVE: received configuration, waiting for command trails")
+        self.DEBUG("WORKER: received configuration, waiting for command trails")
         try:
             command = self.channel.receive()
         except KeyboardInterrupt:
-            return  # in the slave we can't do much about this
+            return  # in the worker we can't do much about this
         self.DEBUG("received", command)
         self.current_command = command
         self.config.hook.pytest_cmdline_main(config=self.config)
@@ -206,7 +214,7 @@ class SlaveFailSession:
         for rep in self.recorded_failures:
             trails.append(rep.nodeid)
             loc = rep.longrepr
-            loc = str(getattr(loc, 'reprcrash', loc))
+            loc = str(getattr(loc, "reprcrash", loc))
             failreports.append(loc)
         self.channel.send((trails, failreports, self.collection_failed))
 
@@ -228,7 +236,7 @@ class StatRecorder:
             changed = self.check()
             if changed:
                 return
-            py.std.time.sleep(checkinterval)
+            time.sleep(checkinterval)
 
     def check(self, removepycfiles=True):  # noqa, too complex
         changed = False
@@ -244,10 +252,12 @@ class StatRecorder:
                         changed = True
                 else:
                     if oldstat:
-                        if oldstat.mtime != curstat.mtime or \
+                        if (
-                           oldstat.size != curstat.size:
+                            oldstat.mtime != curstat.mtime
+                            or oldstat.size != curstat.size
+                        ):
                             changed = True
-                            py.builtin.print_("# MODIFIED", path)
+                            print("# MODIFIED", path)
                             if removepycfiles and path.ext == ".py":
                                 pycfile = path + "c"
                                 if pycfile.check():

src/xdist/newhooks.py

@@ -9,8 +9,9 @@ with the worker instance that executed the hook originally:
 You can use this hooks just as you would use normal pytest hooks, but some care
 must be taken in plugins in case ``xdist`` is not installed. Please see:
 
-    http://pytest.org/latest/writing_plugins.html#optionally-using-hooks-from-3rd-party-plugins
+    http://pytest.org/en/latest/writing_plugins.html#optionally-using-hooks-from-3rd-party-plugins
 """
+import pytest
 
 
 def pytest_xdist_setupnodes(config, specs):
@@ -29,6 +30,11 @@ def pytest_xdist_rsyncfinish(source, gateways):
     """ called after rsyncing a directory to remote gateways takes place. """
 
 
+@pytest.mark.firstresult
+def pytest_xdist_getremotemodule():
+    """ called when creating remote node"""
+
+
 def pytest_configure_node(node):
     """ configure node information before it gets instantiated. """
 
@@ -44,3 +50,18 @@ def pytest_testnodedown(node, error):
 def pytest_xdist_node_collection_finished(node, ids):
     """called by the master node when a node finishes collecting.
     """
+
+
+@pytest.mark.firstresult
+def pytest_xdist_make_scheduler(config, log):
+    """ return a node scheduler implementation """
+
+
+@pytest.mark.firstresult
+def pytest_xdist_auto_num_workers(config):
+    """
+    Return the number of workers to spawn when ``--numprocesses=auto`` is given in the
+    command-line.
+
+    .. versionadded:: 2.1
+    """

src/xdist/plugin.py

@@ -0,0 +1,273 @@
+import os
+import uuid
+
+import py
+import pytest
+
+
+def pytest_xdist_auto_num_workers():
+    try:
+        import psutil
+    except ImportError:
+        pass
+    else:
+        count = psutil.cpu_count(logical=False) or psutil.cpu_count()
+        if count:
+            return count
+    try:
+        from os import sched_getaffinity
+
+        def cpu_count():
+            return len(sched_getaffinity(0))
+
+    except ImportError:
+        if os.environ.get("TRAVIS") == "true":
+            # workaround https://bitbucket.org/pypy/pypy/issues/2375
+            return 2
+        try:
+            from os import cpu_count
+        except ImportError:
+            from multiprocessing import cpu_count
+    try:
+        n = cpu_count()
+    except NotImplementedError:
+        return 1
+    return n if n else 1
+
+
+def parse_numprocesses(s):
+    if s == "auto":
+        return "auto"
+    elif s is not None:
+        return int(s)
+
+
+def pytest_addoption(parser):
+    group = parser.getgroup("xdist", "distributed and subprocess testing")
+    group._addoption(
+        "-n",
+        "--numprocesses",
+        dest="numprocesses",
+        metavar="numprocesses",
+        action="store",
+        type=parse_numprocesses,
+        help="shortcut for '--dist=load --tx=NUM*popen', "
+        "you can use 'auto' here for auto detection CPUs number on "
+        "host system and it will be 0 when used with --pdb",
+    )
+    group.addoption(
+        "--maxprocesses",
+        dest="maxprocesses",
+        metavar="maxprocesses",
+        action="store",
+        type=int,
+        help="limit the maximum number of workers to process the tests when using --numprocesses=auto",
+    )
+    group.addoption(
+        "--max-worker-restart",
+        action="store",
+        default=None,
+        dest="maxworkerrestart",
+        help="maximum number of workers that can be restarted "
+        "when crashed (set to zero to disable this feature)",
+    )
+    group.addoption(
+        "--dist",
+        metavar="distmode",
+        action="store",
+        choices=["each", "load", "loadscope", "loadfile", "no"],
+        dest="dist",
+        default="no",
+        help=(
+            "set mode for distributing tests to exec environments.\n\n"
+            "each: send each test to all available environments.\n\n"
+            "load: load balance by sending any pending test to any"
+            " available environment.\n\n"
+            "loadscope: load balance by sending pending groups of tests in"
+            " the same scope to any available environment.\n\n"
+            "loadfile: load balance by sending test grouped by file"
+            " to any available environment.\n\n"
+            "(default) no: run tests inprocess, don't distribute."
+        ),
+    )
+    group.addoption(
+        "--tx",
+        dest="tx",
+        action="append",
+        default=[],
+        metavar="xspec",
+        help=(
+            "add a test execution environment. some examples: "
+            "--tx popen//python=python2.5 --tx socket=192.168.1.102:8888 "
+            "--tx ssh=user@codespeak.net//chdir=testcache"
+        ),
+    )
+    group._addoption(
+        "-d",
+        action="store_true",
+        dest="distload",
+        default=False,
+        help="load-balance tests.  shortcut for '--dist=load'",
+    )
+    group.addoption(
+        "--rsyncdir",
+        action="append",
+        default=[],
+        metavar="DIR",
+        help="add directory for rsyncing to remote tx nodes.",
+    )
+    group.addoption(
+        "--rsyncignore",
+        action="append",
+        default=[],
+        metavar="GLOB",
+        help="add expression for ignores when rsyncing to remote tx nodes.",
+    )
+    group.addoption(
+        "--boxed",
+        action="store_true",
+        help="backward compatibility alias for pytest-forked --forked",
+    )
+    group.addoption(
+        "--testrunuid",
+        action="store",
+        help=(
+            "provide an identifier shared amongst all workers as the value of "
+            "the 'testrun_uid' fixture,\n\n,"
+            "if not provided, 'testrun_uid' is filled with a new unique string "
+            "on every test run."
+        ),
+    )
+
+    parser.addini(
+        "rsyncdirs",
+        "list of (relative) paths to be rsynced for remote distributed testing.",
+        type="pathlist",
+    )
+    parser.addini(
+        "rsyncignore",
+        "list of (relative) glob-style paths to be ignored for rsyncing.",
+        type="pathlist",
+    )
+    parser.addini(
+        "looponfailroots",
+        type="pathlist",
+        help="directories to check for changes",
+        default=[py.path.local()],
+    )
+
+
+# -------------------------------------------------------------------------
+# distributed testing hooks
+# -------------------------------------------------------------------------
+
+
+def pytest_addhooks(pluginmanager):
+    from xdist import newhooks
+
+    pluginmanager.add_hookspecs(newhooks)
+
+
+# -------------------------------------------------------------------------
+# distributed testing initialization
+# -------------------------------------------------------------------------
+
+
+@pytest.mark.trylast
+def pytest_configure(config):
+    if config.getoption("dist") != "no" and not config.getvalue("collectonly"):
+        from xdist.dsession import DSession
+
+        session = DSession(config)
+        config.pluginmanager.register(session, "dsession")
+        tr = config.pluginmanager.getplugin("terminalreporter")
+        if tr:
+            tr.showfspath = False
+    if config.getoption("boxed"):
+        config.option.forked = True
+
+
+@pytest.mark.tryfirst
+def pytest_cmdline_main(config):
+    usepdb = config.getoption("usepdb", False)  # a core option
+    if config.option.numprocesses == "auto":
+        if usepdb:
+            config.option.numprocesses = 0
+            config.option.dist = "no"
+        else:
+            auto_num_cpus = config.hook.pytest_xdist_auto_num_workers(config=config)
+            config.option.numprocesses = auto_num_cpus
+
+    if config.option.numprocesses:
+        if config.option.dist == "no":
+            config.option.dist = "load"
+        numprocesses = config.option.numprocesses
+        if config.option.maxprocesses:
+            numprocesses = min(numprocesses, config.option.maxprocesses)
+        config.option.tx = ["popen"] * numprocesses
+    if config.option.distload:
+        config.option.dist = "load"
+    val = config.getvalue
+    if not val("collectonly") and val("dist") != "no" and usepdb:
+        raise pytest.UsageError(
+            "--pdb is incompatible with distributing tests; try using -n0 or -nauto."
+        )  # noqa: E501
+
+
+# -------------------------------------------------------------------------
+# fixtures and API to easily know the role of current node
+# -------------------------------------------------------------------------
+
+
+def is_xdist_worker(request_or_session) -> bool:
+    """Return `True` if this is an xdist worker, `False` otherwise
+
+    :param request_or_session: the `pytest` `request` or `session` object
+    """
+    return hasattr(request_or_session.config, "workerinput")
+
+
+def is_xdist_master(request_or_session) -> bool:
+    """Return `True` if this is the xdist master, `False` otherwise
+
+    Note: this method also returns `False` when distribution has not been
+    activated at all.
+
+    :param request_or_session: the `pytest` `request` or `session` object
+    """
+    return (
+        not is_xdist_worker(request_or_session)
+        and request_or_session.config.option.dist != "no"
+    )
+
+
+def get_xdist_worker_id(request_or_session) -> str:
+    """Return the id of the current worker ('gw0', 'gw1', etc) or 'master'
+    if running on the 'master' node.
+
+    If not distributing tests (for example passing `-n0` or not passing `-n` at all)
+    also return 'master'.
+
+    :param request_or_session: the `pytest` `request` or `session` object
+    """
+    if hasattr(request_or_session.config, "workerinput"):
+        return request_or_session.config.workerinput["workerid"]
+    else:
+        return "master"
+
+
+@pytest.fixture(scope="session")
+def worker_id(request):
+    """Return the id of the current worker ('gw0', 'gw1', etc) or 'master'
+    if running on the master node.
+    """
+    return get_xdist_worker_id(request)
+
+
+@pytest.fixture(scope="session")
+def testrun_uid(request):
+    """Return the unique id of the current test."""
+    if hasattr(request.config, "workerinput"):
+        return request.config.workerinput["testrunuid"]
+    else:
+        return uuid.uuid4().hex

src/xdist/remote.py

@@ -0,0 +1,239 @@
+"""
+    This module is executed in remote subprocesses and helps to
+    control a remote testing session and relay back information.
+    It assumes that 'py' is importable and does not have dependencies
+    on the rest of the xdist code.  This means that the xdist-plugin
+    needs not to be installed in remote environments.
+"""
+
+import sys
+import os
+import time
+
+import py
+import pytest
+from execnet.gateway_base import dumps, DumpError
+
+from _pytest.config import _prepareconfig, Config
+
+
+class WorkerInteractor:
+    def __init__(self, config, channel):
+        self.config = config
+        self.workerid = config.workerinput.get("workerid", "?")
+        self.testrunuid = config.workerinput["testrunuid"]
+        self.log = py.log.Producer("worker-%s" % self.workerid)
+        if not config.option.debug:
+            py.log.setconsumer(self.log._keywords, None)
+        self.channel = channel
+        config.pluginmanager.register(self)
+
+    def sendevent(self, name, **kwargs):
+        self.log("sending", name, kwargs)
+        self.channel.send((name, kwargs))
+
+    def pytest_internalerror(self, excrepr):
+        formatted_error = str(excrepr)
+        for line in formatted_error.split("\n"):
+            self.log("IERROR>", line)
+        interactor.sendevent("internal_error", formatted_error=formatted_error)
+
+    def pytest_sessionstart(self, session):
+        self.session = session
+        workerinfo = getinfodict()
+        self.sendevent("workerready", workerinfo=workerinfo)
+
+    @pytest.hookimpl(hookwrapper=True)
+    def pytest_sessionfinish(self, exitstatus):
+        # in pytest 5.0+, exitstatus is an IntEnum object
+        self.config.workeroutput["exitstatus"] = int(exitstatus)
+        yield
+        self.sendevent("workerfinished", workeroutput=self.config.workeroutput)
+
+    def pytest_collection(self, session):
+        self.sendevent("collectionstart")
+
+    def pytest_runtestloop(self, session):
+        self.log("entering main loop")
+        torun = []
+        while 1:
+            try:
+                name, kwargs = self.channel.receive()
+            except EOFError:
+                return True
+            self.log("received command", name, kwargs)
+            if name == "runtests":
+                torun.extend(kwargs["indices"])
+            elif name == "runtests_all":
+                torun.extend(range(len(session.items)))
+            self.log("items to run:", torun)
+            # only run if we have an item and a next item
+            while len(torun) >= 2:
+                self.run_one_test(torun)
+            if name == "shutdown":
+                if torun:
+                    self.run_one_test(torun)
+                break
+        return True
+
+    def run_one_test(self, torun):
+        items = self.session.items
+        self.item_index = torun.pop(0)
+        item = items[self.item_index]
+        if torun:
+            nextitem = items[torun[0]]
+        else:
+            nextitem = None
+
+        start = time.time()
+        self.config.hook.pytest_runtest_protocol(item=item, nextitem=nextitem)
+        duration = time.time() - start
+        self.sendevent(
+            "runtest_protocol_complete", item_index=self.item_index, duration=duration
+        )
+
+    def pytest_collection_finish(self, session):
+        self.sendevent(
+            "collectionfinish",
+            topdir=str(session.fspath),
+            ids=[item.nodeid for item in session.items],
+        )
+
+    def pytest_runtest_logstart(self, nodeid, location):
+        self.sendevent("logstart", nodeid=nodeid, location=location)
+
+    def pytest_runtest_logfinish(self, nodeid, location):
+        self.sendevent("logfinish", nodeid=nodeid, location=location)
+
+    def pytest_runtest_logreport(self, report):
+        data = self.config.hook.pytest_report_to_serializable(
+            config=self.config, report=report
+        )
+        data["item_index"] = self.item_index
+        data["worker_id"] = self.workerid
+        data["testrun_uid"] = self.testrunuid
+        assert self.session.items[self.item_index].nodeid == report.nodeid
+        self.sendevent("testreport", data=data)
+
+    def pytest_collectreport(self, report):
+        # send only reports that have not passed to master as optimization (#330)
+        if not report.passed:
+            data = self.config.hook.pytest_report_to_serializable(
+                config=self.config, report=report
+            )
+            self.sendevent("collectreport", data=data)
+
+    def pytest_warning_recorded(self, warning_message, when, nodeid, location):
+        self.sendevent(
+            "warning_recorded",
+            warning_message_data=serialize_warning_message(warning_message),
+            when=when,
+            nodeid=nodeid,
+            location=location,
+        )
+
+
+def serialize_warning_message(warning_message):
+    if isinstance(warning_message.message, Warning):
+        message_module = type(warning_message.message).__module__
+        message_class_name = type(warning_message.message).__name__
+        message_str = str(warning_message.message)
+        # check now if we can serialize the warning arguments (#349)
+        # if not, we will just use the exception message on the master node
+        try:
+            dumps(warning_message.message.args)
+        except DumpError:
+            message_args = None
+        else:
+            message_args = warning_message.message.args
+    else:
+        message_str = warning_message.message
+        message_module = None
+        message_class_name = None
+        message_args = None
+    if warning_message.category:
+        category_module = warning_message.category.__module__
+        category_class_name = warning_message.category.__name__
+    else:
+        category_module = None
+        category_class_name = None
+
+    result = {
+        "message_str": message_str,
+        "message_module": message_module,
+        "message_class_name": message_class_name,
+        "message_args": message_args,
+        "category_module": category_module,
+        "category_class_name": category_class_name,
+    }
+    # access private _WARNING_DETAILS because the attributes vary between Python versions
+    for attr_name in warning_message._WARNING_DETAILS:
+        if attr_name in ("message", "category"):
+            continue
+        attr = getattr(warning_message, attr_name)
+        # Check if we can serialize the warning detail, marking `None` otherwise
+        # Note that we need to define the attr (even as `None`) to allow deserializing
+        try:
+            dumps(attr)
+        except DumpError:
+            result[attr_name] = repr(attr)
+        else:
+            result[attr_name] = attr
+    return result
+
+
+def getinfodict():
+    import platform
+
+    return dict(
+        version=sys.version,
+        version_info=tuple(sys.version_info),
+        sysplatform=sys.platform,
+        platform=platform.platform(),
+        executable=sys.executable,
+        cwd=os.getcwd(),
+    )
+
+
+def remote_initconfig(option_dict, args):
+    option_dict["plugins"].append("no:terminal")
+    return Config.fromdictargs(option_dict, args)
+
+
+def setup_config(config, basetemp):
+    config.option.looponfail = False
+    config.option.usepdb = False
+    config.option.dist = "no"
+    config.option.distload = False
+    config.option.numprocesses = None
+    config.option.maxprocesses = None
+    config.option.basetemp = basetemp
+
+
+if __name__ == "__channelexec__":
+    channel = channel  # noqa
+    workerinput, args, option_dict, change_sys_path = channel.receive()
+
+    if change_sys_path:
+        importpath = os.getcwd()
+        sys.path.insert(0, importpath)
+        os.environ["PYTHONPATH"] = (
+            importpath + os.pathsep + os.environ.get("PYTHONPATH", "")
+        )
+
+    os.environ["PYTEST_XDIST_TESTRUNUID"] = workerinput["testrunuid"]
+    os.environ["PYTEST_XDIST_WORKER"] = workerinput["workerid"]
+    os.environ["PYTEST_XDIST_WORKER_COUNT"] = str(workerinput["workercount"])
+
+    if hasattr(Config, "InvocationParams"):
+        config = _prepareconfig(args, None)
+    else:
+        config = remote_initconfig(option_dict, args)
+        config.args = args
+
+    setup_config(config, option_dict.get("basetemp"))
+    config._parser.prog = os.path.basename(workerinput["mainargv"][0])
+    config.workerinput = workerinput
+    config.workeroutput = {}
+    interactor = WorkerInteractor(config, channel)
+    config.hook.pytest_cmdline_main(config=config)

src/xdist/report.py

@@ -0,0 +1,20 @@
+from difflib import unified_diff
+
+
+def report_collection_diff(from_collection, to_collection, from_id, to_id):
+    """Report the collected test difference between two nodes.
+
+    :returns: detailed message describing the difference between the given
+    collections, or None if they are equal.
+    """
+    if from_collection == to_collection:
+        return None
+
+    diff = unified_diff(from_collection, to_collection, fromfile=from_id, tofile=to_id)
+    error_message = (
+        "Different tests were collected between {from_id} and {to_id}. "
+        "The difference is:\n"
+        "{diff}"
+    ).format(from_id=from_id, to_id=to_id, diff="\n".join(diff))
+    msg = "\n".join([x.rstrip() for x in error_message.split("\n")])
+    return msg

src/xdist/scheduler/__init__.py

@@ -0,0 +1,4 @@
+from xdist.scheduler.each import EachScheduling  # noqa
+from xdist.scheduler.load import LoadScheduling  # noqa
+from xdist.scheduler.loadfile import LoadFileScheduling  # noqa
+from xdist.scheduler.loadscope import LoadScopeScheduling  # noqa

src/xdist/scheduler/each.py

@@ -0,0 +1,132 @@
+from py.log import Producer
+
+from xdist.workermanage import parse_spec_config
+from xdist.report import report_collection_diff
+
+
+class EachScheduling:
+    """Implement scheduling of test items on all nodes
+
+    If a node gets added after the test run is started then it is
+    assumed to replace a node which got removed before it finished
+    its collection.  In this case it will only be used if a node
+    with the same spec got removed earlier.
+
+    Any nodes added after the run is started will only get items
+    assigned if a node with a matching spec was removed before it
+    finished all its pending items.  The new node will then be
+    assigned the remaining items from the removed node.
+    """
+
+    def __init__(self, config, log=None):
+        self.config = config
+        self.numnodes = len(parse_spec_config(config))
+        self.node2collection = {}
+        self.node2pending = {}
+        self._started = []
+        self._removed2pending = {}
+        if log is None:
+            self.log = Producer("eachsched")
+        else:
+            self.log = log.eachsched
+        self.collection_is_completed = False
+
+    @property
+    def nodes(self):
+        """A list of all nodes in the scheduler."""
+        return list(self.node2pending.keys())
+
+    @property
+    def tests_finished(self):
+        if not self.collection_is_completed:
+            return False
+        if self._removed2pending:
+            return False
+        for pending in self.node2pending.values():
+            if len(pending) >= 2:
+                return False
+        return True
+
+    @property
+    def has_pending(self):
+        """Return True if there are pending test items
+
+        This indicates that collection has finished and nodes are
+        still processing test items, so this can be thought of as
+        "the scheduler is active".
+        """
+        for pending in self.node2pending.values():
+            if pending:
+                return True
+        return False
+
+    def add_node(self, node):
+        assert node not in self.node2pending
+        self.node2pending[node] = []
+
+    def add_node_collection(self, node, collection):
+        """Add the collected test items from a node
+
+        Collection is complete once all nodes have submitted their
+        collection.  In this case its pending list is set to an empty
+        list.  When the collection is already completed this
+        submission is from a node which was restarted to replace a
+        dead node.  In this case we already assign the pending items
+        here.  In either case ``.schedule()`` will instruct the
+        node to start running the required tests.
+        """
+        assert node in self.node2pending
+        if not self.collection_is_completed:
+            self.node2collection[node] = list(collection)
+            self.node2pending[node] = []
+            if len(self.node2collection) >= self.numnodes:
+                self.collection_is_completed = True
+        elif self._removed2pending:
+            for deadnode in self._removed2pending:
+                if deadnode.gateway.spec == node.gateway.spec:
+                    dead_collection = self.node2collection[deadnode]
+                    if collection != dead_collection:
+                        msg = report_collection_diff(
+                            dead_collection,
+                            collection,
+                            deadnode.gateway.id,
+                            node.gateway.id,
+                        )
+                        self.log(msg)
+                        return
+                    pending = self._removed2pending.pop(deadnode)
+                    self.node2pending[node] = pending
+                    break
+
+    def mark_test_complete(self, node, item_index, duration=0):
+        self.node2pending[node].remove(item_index)
+
+    def remove_node(self, node):
+        # KeyError if we didn't get an add_node() yet
+        pending = self.node2pending.pop(node)
+        if not pending:
+            return
+        crashitem = self.node2collection[node][pending.pop(0)]
+        if pending:
+            self._removed2pending[node] = pending
+        return crashitem
+
+    def schedule(self):
+        """Schedule the test items on the nodes
+
+        If the node's pending list is empty it is a new node which
+        needs to run all the tests.  If the pending list is already
+        populated (by ``.add_node_collection()``) then it replaces a
+        dead node and we only need to run those tests.
+        """
+        assert self.collection_is_completed
+        for node, pending in self.node2pending.items():
+            if node in self._started:
+                continue
+            if not pending:
+                pending[:] = range(len(self.node2collection[node]))
+                node.send_runtest_all()
+                node.shutdown()
+            else:
+                node.send_runtest_some(pending)
+            self._started.append(node)

src/xdist/scheduler/load.py

@@ -0,0 +1,286 @@
+from itertools import cycle
+
+from py.log import Producer
+from _pytest.runner import CollectReport
+
+from xdist.workermanage import parse_spec_config
+from xdist.report import report_collection_diff
+
+
+class LoadScheduling:
+    """Implement load scheduling across nodes.
+
+    This distributes the tests collected across all nodes so each test
+    is run just once.  All nodes collect and submit the test suite and
+    when all collections are received it is verified they are
+    identical collections.  Then the collection gets divided up in
+    chunks and chunks get submitted to nodes.  Whenever a node finishes
+    an item, it calls ``.mark_test_complete()`` which will trigger the
+    scheduler to assign more tests if the number of pending tests for
+    the node falls below a low-watermark.
+
+    When created, ``numnodes`` defines how many nodes are expected to
+    submit a collection. This is used to know when all nodes have
+    finished collection or how large the chunks need to be created.
+
+    Attributes:
+
+    :numnodes: The expected number of nodes taking part.  The actual
+       number of nodes will vary during the scheduler's lifetime as
+       nodes are added by the DSession as they are brought up and
+       removed either because of a dead node or normal shutdown.  This
+       number is primarily used to know when the initial collection is
+       completed.
+
+    :node2collection: Map of nodes and their test collection.  All
+       collections should always be identical.
+
+    :node2pending: Map of nodes and the indices of their pending
+       tests.  The indices are an index into ``.pending`` (which is
+       identical to their own collection stored in
+       ``.node2collection``).
+
+    :collection: The one collection once it is validated to be
+       identical between all the nodes.  It is initialised to None
+       until ``.schedule()`` is called.
+
+    :pending: List of indices of globally pending tests.  These are
+       tests which have not yet been allocated to a chunk for a node
+       to process.
+
+    :log: A py.log.Producer instance.
+
+    :config: Config object, used for handling hooks.
+    """
+
+    def __init__(self, config, log=None):
+        self.numnodes = len(parse_spec_config(config))
+        self.node2collection = {}
+        self.node2pending = {}
+        self.pending = []
+        self.collection = None
+        if log is None:
+            self.log = Producer("loadsched")
+        else:
+            self.log = log.loadsched
+        self.config = config
+
+    @property
+    def nodes(self):
+        """A list of all nodes in the scheduler."""
+        return list(self.node2pending.keys())
+
+    @property
+    def collection_is_completed(self):
+        """Boolean indication initial test collection is complete.
+
+        This is a boolean indicating all initial participating nodes
+        have finished collection.  The required number of initial
+        nodes is defined by ``.numnodes``.
+        """
+        return len(self.node2collection) >= self.numnodes
+
+    @property
+    def tests_finished(self):
+        """Return True if all tests have been executed by the nodes."""
+        if not self.collection_is_completed:
+            return False
+        if self.pending:
+            return False
+        for pending in self.node2pending.values():
+            if len(pending) >= 2:
+                return False
+        return True
+
+    @property
+    def has_pending(self):
+        """Return True if there are pending test items
+
+        This indicates that collection has finished and nodes are
+        still processing test items, so this can be thought of as
+        "the scheduler is active".
+        """
+        if self.pending:
+            return True
+        for pending in self.node2pending.values():
+            if pending:
+                return True
+        return False
+
+    def add_node(self, node):
+        """Add a new node to the scheduler.
+
+        From now on the node will be allocated chunks of tests to
+        execute.
+
+        Called by the ``DSession.worker_workerready`` hook when it
+        successfully bootstraps a new node.
+        """
+        assert node not in self.node2pending
+        self.node2pending[node] = []
+
+    def add_node_collection(self, node, collection):
+        """Add the collected test items from a node
+
+        The collection is stored in the ``.node2collection`` map.
+        Called by the ``DSession.worker_collectionfinish`` hook.
+        """
+        assert node in self.node2pending
+        if self.collection_is_completed:
+            # A new node has been added later, perhaps an original one died.
+            # .schedule() should have
+            # been called by now
+            assert self.collection
+            if collection != self.collection:
+                other_node = next(iter(self.node2collection.keys()))
+                msg = report_collection_diff(
+                    self.collection, collection, other_node.gateway.id, node.gateway.id
+                )
+                self.log(msg)
+                return
+        self.node2collection[node] = list(collection)
+
+    def mark_test_complete(self, node, item_index, duration=0):
+        """Mark test item as completed by node
+
+        The duration it took to execute the item is used as a hint to
+        the scheduler.
+
+        This is called by the ``DSession.worker_testreport`` hook.
+        """
+        self.node2pending[node].remove(item_index)
+        self.check_schedule(node, duration=duration)
+
+    def check_schedule(self, node, duration=0):
+        """Maybe schedule new items on the node
+
+        If there are any globally pending nodes left then this will
+        check if the given node should be given any more tests.  The
+        ``duration`` of the last test is optionally used as a
+        heuristic to influence how many tests the node is assigned.
+        """
+        if node.shutting_down:
+            return
+
+        if self.pending:
+            # how many nodes do we have?
+            num_nodes = len(self.node2pending)
+            # if our node goes below a heuristic minimum, fill it out to
+            # heuristic maximum
+            items_per_node_min = max(2, len(self.pending) // num_nodes // 4)
+            items_per_node_max = max(2, len(self.pending) // num_nodes // 2)
+            node_pending = self.node2pending[node]
+            if len(node_pending) < items_per_node_min:
+                if duration >= 0.1 and len(node_pending) >= 2:
+                    # seems the node is doing long-running tests
+                    # and has enough items to continue
+                    # so let's rather wait with sending new items
+                    return
+                num_send = items_per_node_max - len(node_pending)
+                self._send_tests(node, num_send)
+        else:
+            node.shutdown()
+
+        self.log("num items waiting for node:", len(self.pending))
+
+    def remove_node(self, node):
+        """Remove a node from the scheduler
+
+        This should be called either when the node crashed or at
+        shutdown time.  In the former case any pending items assigned
+        to the node will be re-scheduled.  Called by the
+        ``DSession.worker_workerfinished`` and
+        ``DSession.worker_errordown`` hooks.
+
+        Return the item which was being executing while the node
+        crashed or None if the node has no more pending items.
+
+        """
+        pending = self.node2pending.pop(node)
+        if not pending:
+            return
+
+        # The node crashed, reassing pending items
+        crashitem = self.collection[pending.pop(0)]
+        self.pending.extend(pending)
+        for node in self.node2pending:
+            self.check_schedule(node)
+        return crashitem
+
+    def schedule(self):
+        """Initiate distribution of the test collection
+
+        Initiate scheduling of the items across the nodes.  If this
+        gets called again later it behaves the same as calling
+        ``.check_schedule()`` on all nodes so that newly added nodes
+        will start to be used.
+
+        This is called by the ``DSession.worker_collectionfinish`` hook
+        if ``.collection_is_completed`` is True.
+        """
+        assert self.collection_is_completed
+
+        # Initial distribution already happened, reschedule on all nodes
+        if self.collection is not None:
+            for node in self.nodes:
+                self.check_schedule(node)
+            return
+
+        # XXX allow nodes to have different collections
+        if not self._check_nodes_have_same_collection():
+            self.log("**Different tests collected, aborting run**")
+            return
+
+        # Collections are identical, create the index of pending items.
+        self.collection = list(self.node2collection.values())[0]
+        self.pending[:] = range(len(self.collection))
+        if not self.collection:
+            return
+
+        # Send a batch of tests to run. If we don't have at least two
+        # tests per node, we have to send them all so that we can send
+        # shutdown signals and get all nodes working.
+        initial_batch = max(len(self.pending) // 4, 2 * len(self.nodes))
+
+        # distribute tests round-robin up to the batch size
+        # (or until we run out)
+        nodes = cycle(self.nodes)
+        for i in range(initial_batch):
+            self._send_tests(next(nodes), 1)
+
+        if not self.pending:
+            # initial distribution sent all tests, start node shutdown
+            for node in self.nodes:
+                node.shutdown()
+
+    def _send_tests(self, node, num):
+        tests_per_node = self.pending[:num]
+        if tests_per_node:
+            del self.pending[:num]
+            self.node2pending[node].extend(tests_per_node)
+            node.send_runtest_some(tests_per_node)
+
+    def _check_nodes_have_same_collection(self):
+        """Return True if all nodes have collected the same items.
+
+        If collections differ, this method returns False while logging
+        the collection differences and posting collection errors to
+        pytest_collectreport hook.
+        """
+        node_collection_items = list(self.node2collection.items())
+        first_node, col = node_collection_items[0]
+        same_collection = True
+        for node, collection in node_collection_items[1:]:
+            msg = report_collection_diff(
+                col, collection, first_node.gateway.id, node.gateway.id
+            )
+            if msg:
+                same_collection = False
+                self.log(msg)
+                if self.config is not None:
+                    rep = CollectReport(
+                        node.gateway.id, "failed", longrepr=msg, result=[]
+                    )
+                    self.config.hook.pytest_collectreport(report=rep)
+
+        return same_collection

src/xdist/scheduler/loadfile.py

@@ -0,0 +1,52 @@
+from .loadscope import LoadScopeScheduling
+from py.log import Producer
+
+
+class LoadFileScheduling(LoadScopeScheduling):
+    """Implement load scheduling across nodes, but grouping test test file.
+
+    This distributes the tests collected across all nodes so each test is run
+    just once.  All nodes collect and submit the list of tests and when all
+    collections are received it is verified they are identical collections.
+    Then the collection gets divided up in work units, grouped by test file,
+    and those work units get submitted to nodes.  Whenever a node finishes an
+    item, it calls ``.mark_test_complete()`` which will trigger the scheduler
+    to assign more work units if the number of pending tests for the node falls
+    below a low-watermark.
+
+    When created, ``numnodes`` defines how many nodes are expected to submit a
+    collection. This is used to know when all nodes have finished collection.
+
+    This class behaves very much like LoadScopeScheduling, but with a file-level scope.
+    """
+
+    def __init__(self, config, log=None):
+        super().__init__(config, log)
+        if log is None:
+            self.log = Producer("loadfilesched")
+        else:
+            self.log = log.loadfilesched
+
+    def _split_scope(self, nodeid):
+        """Determine the scope (grouping) of a nodeid.
+
+        There are usually 3 cases for a nodeid::
+
+            example/loadsuite/test/test_beta.py::test_beta0
+            example/loadsuite/test/test_delta.py::Delta1::test_delta0
+            example/loadsuite/epsilon/__init__.py::epsilon.epsilon
+
+        #. Function in a test module.
+        #. Method of a class in a test module.
+        #. Doctest in a function in a package.
+
+        This function will group tests with the scope determined by splitting
+        the first ``::`` from the left. That is, test will be grouped in a
+        single work unit when they reside in the same file.
+         In the above example, scopes will be::
+
+            example/loadsuite/test/test_beta.py
+            example/loadsuite/test/test_delta.py
+            example/loadsuite/epsilon/__init__.py
+        """
+        return nodeid.split("::", 1)[0]

src/xdist/scheduler/loadscope.py

@@ -0,0 +1,409 @@
+from collections import OrderedDict
+
+from _pytest.runner import CollectReport
+from py.log import Producer
+from xdist.report import report_collection_diff
+from xdist.workermanage import parse_spec_config
+
+
+class LoadScopeScheduling:
+    """Implement load scheduling across nodes, but grouping test by scope.
+
+    This distributes the tests collected across all nodes so each test is run
+    just once.  All nodes collect and submit the list of tests and when all
+    collections are received it is verified they are identical collections.
+    Then the collection gets divided up in work units, grouped by test scope,
+    and those work units get submitted to nodes.  Whenever a node finishes an
+    item, it calls ``.mark_test_complete()`` which will trigger the scheduler
+    to assign more work units if the number of pending tests for the node falls
+    below a low-watermark.
+
+    When created, ``numnodes`` defines how many nodes are expected to submit a
+    collection. This is used to know when all nodes have finished collection.
+
+    Attributes:
+
+    :numnodes: The expected number of nodes taking part.  The actual number of
+       nodes will vary during the scheduler's lifetime as nodes are added by
+       the DSession as they are brought up and removed either because of a dead
+       node or normal shutdown.  This number is primarily used to know when the
+       initial collection is completed.
+
+    :collection: The final list of tests collected by all nodes once it is
+       validated to be identical between all the nodes.  It is initialised to
+       None until ``.schedule()`` is called.
+
+    :workqueue: Ordered dictionary that maps all available scopes with their
+       associated tests (nodeid). Nodeids are in turn associated with their
+       completion status. One entry of the workqueue is called a work unit.
+       In turn, a collection of work unit is called a workload.
+
+       ::
+
+            workqueue = {
+                '<full>/<path>/<to>/test_module.py': {
+                    '<full>/<path>/<to>/test_module.py::test_case1': False,
+                    '<full>/<path>/<to>/test_module.py::test_case2': False,
+                    (...)
+                },
+                (...)
+            }
+
+    :assigned_work: Ordered dictionary that maps worker nodes with their
+       assigned work units.
+
+       ::
+
+            assigned_work = {
+                '<worker node A>': {
+                    '<full>/<path>/<to>/test_module.py': {
+                        '<full>/<path>/<to>/test_module.py::test_case1': False,
+                        '<full>/<path>/<to>/test_module.py::test_case2': False,
+                        (...)
+                    },
+                    (...)
+                },
+                (...)
+            }
+
+    :registered_collections: Ordered dictionary that maps worker nodes with
+       their collection of tests gathered during test discovery.
+
+       ::
+
+            registered_collections = {
+                '<worker node A>': [
+                    '<full>/<path>/<to>/test_module.py::test_case1',
+                    '<full>/<path>/<to>/test_module.py::test_case2',
+                ],
+                (...)
+            }
+
+    :log: A py.log.Producer instance.
+
+    :config: Config object, used for handling hooks.
+    """
+
+    def __init__(self, config, log=None):
+        self.numnodes = len(parse_spec_config(config))
+        self.collection = None
+
+        self.workqueue = OrderedDict()
+        self.assigned_work = OrderedDict()
+        self.registered_collections = OrderedDict()
+
+        if log is None:
+            self.log = Producer("loadscopesched")
+        else:
+            self.log = log.loadscopesched
+
+        self.config = config
+
+    @property
+    def nodes(self):
+        """A list of all active nodes in the scheduler."""
+        return list(self.assigned_work.keys())
+
+    @property
+    def collection_is_completed(self):
+        """Boolean indication initial test collection is complete.
+
+        This is a boolean indicating all initial participating nodes have
+        finished collection.  The required number of initial nodes is defined
+        by ``.numnodes``.
+        """
+        return len(self.registered_collections) >= self.numnodes
+
+    @property
+    def tests_finished(self):
+        """Return True if all tests have been executed by the nodes."""
+        if not self.collection_is_completed:
+            return False
+
+        if self.workqueue:
+            return False
+
+        for assigned_unit in self.assigned_work.values():
+            if self._pending_of(assigned_unit) >= 2:
+                return False
+
+        return True
+
+    @property
+    def has_pending(self):
+        """Return True if there are pending test items.
+
+        This indicates that collection has finished and nodes are still
+        processing test items, so this can be thought of as
+        "the scheduler is active".
+        """
+        if self.workqueue:
+            return True
+
+        for assigned_unit in self.assigned_work.values():
+            if self._pending_of(assigned_unit) > 0:
+                return True
+
+        return False
+
+    def add_node(self, node):
+        """Add a new node to the scheduler.
+
+        From now on the node will be assigned work units to be executed.
+
+        Called by the ``DSession.worker_workerready`` hook when it successfully
+        bootstraps a new node.
+        """
+        assert node not in self.assigned_work
+        self.assigned_work[node] = OrderedDict()
+
+    def remove_node(self, node):
+        """Remove a node from the scheduler.
+
+        This should be called either when the node crashed or at shutdown time.
+        In the former case any pending items assigned to the node will be
+        re-scheduled.
+
+        Called by the hooks:
+
+        - ``DSession.worker_workerfinished``.
+        - ``DSession.worker_errordown``.
+
+        Return the item being executed while the node crashed or None if the
+        node has no more pending items.
+        """
+        workload = self.assigned_work.pop(node)
+        if not self._pending_of(workload):
+            return None
+
+        # The node crashed, identify test that crashed
+        for work_unit in workload.values():
+            for nodeid, completed in work_unit.items():
+                if not completed:
+                    crashitem = nodeid
+                    break
+            else:
+                continue
+            break
+        else:
+            raise RuntimeError(
+                "Unable to identify crashitem on a workload with pending items"
+            )
+
+        # Made uncompleted work unit available again
+        self.workqueue.update(workload)
+
+        for node in self.assigned_work:
+            self._reschedule(node)
+
+        return crashitem
+
+    def add_node_collection(self, node, collection):
+        """Add the collected test items from a node.
+
+        The collection is stored in the ``.registered_collections`` dictionary.
+
+        Called by the hook:
+
+        - ``DSession.worker_collectionfinish``.
+        """
+
+        # Check that add_node() was called on the node before
+        assert node in self.assigned_work
+
+        # A new node has been added later, perhaps an original one died.
+        if self.collection_is_completed:
+
+            # Assert that .schedule() should have been called by now
+            assert self.collection
+
+            # Check that the new collection matches the official collection
+            if collection != self.collection:
+
+                other_node = next(iter(self.registered_collections.keys()))
+
+                msg = report_collection_diff(
+                    self.collection, collection, other_node.gateway.id, node.gateway.id
+                )
+                self.log(msg)
+                return
+
+        self.registered_collections[node] = list(collection)
+
+    def mark_test_complete(self, node, item_index, duration=0):
+        """Mark test item as completed by node.
+
+        Called by the hook:
+
+        - ``DSession.worker_testreport``.
+        """
+        nodeid = self.registered_collections[node][item_index]
+        scope = self._split_scope(nodeid)
+
+        self.assigned_work[node][scope][nodeid] = True
+        self._reschedule(node)
+
+    def _assign_work_unit(self, node):
+        """Assign a work unit to a node."""
+        assert self.workqueue
+
+        # Grab a unit of work
+        scope, work_unit = self.workqueue.popitem(last=False)
+
+        # Keep track of the assigned work
+        assigned_to_node = self.assigned_work.setdefault(node, default=OrderedDict())
+        assigned_to_node[scope] = work_unit
+
+        # Ask the node to execute the workload
+        worker_collection = self.registered_collections[node]
+        nodeids_indexes = [
+            worker_collection.index(nodeid)
+            for nodeid, completed in work_unit.items()
+            if not completed
+        ]
+
+        node.send_runtest_some(nodeids_indexes)
+
+    def _split_scope(self, nodeid):
+        """Determine the scope (grouping) of a nodeid.
+
+        There are usually 3 cases for a nodeid::
+
+            example/loadsuite/test/test_beta.py::test_beta0
+            example/loadsuite/test/test_delta.py::Delta1::test_delta0
+            example/loadsuite/epsilon/__init__.py::epsilon.epsilon
+
+        #. Function in a test module.
+        #. Method of a class in a test module.
+        #. Doctest in a function in a package.
+
+        This function will group tests with the scope determined by splitting
+        the first ``::`` from the right. That is, classes will be grouped in a
+        single work unit, and functions from a test module will be grouped by
+        their module. In the above example, scopes will be::
+
+            example/loadsuite/test/test_beta.py
+            example/loadsuite/test/test_delta.py::Delta1
+            example/loadsuite/epsilon/__init__.py
+        """
+        return nodeid.rsplit("::", 1)[0]
+
+    def _pending_of(self, workload):
+        """Return the number of pending tests in a workload."""
+        pending = sum(list(scope.values()).count(False) for scope in workload.values())
+        return pending
+
+    def _reschedule(self, node):
+        """Maybe schedule new items on the node.
+
+        If there are any globally pending work units left then this will check
+        if the given node should be given any more tests.
+        """
+
+        # Do not add more work to a node shutting down
+        if node.shutting_down:
+            return
+
+        # Check that more work is available
+        if not self.workqueue:
+            node.shutdown()
+            return
+
+        self.log("Number of units waiting for node:", len(self.workqueue))
+
+        # Check that the node is almost depleted of work
+        # 2: Heuristic of minimum tests to enqueue more work
+        if self._pending_of(self.assigned_work[node]) > 2:
+            return
+
+        # Pop one unit of work and assign it
+        self._assign_work_unit(node)
+
+    def schedule(self):
+        """Initiate distribution of the test collection.
+
+        Initiate scheduling of the items across the nodes.  If this gets called
+        again later it behaves the same as calling ``._reschedule()`` on all
+        nodes so that newly added nodes will start to be used.
+
+        If ``.collection_is_completed`` is True, this is called by the hook:
+
+        - ``DSession.worker_collectionfinish``.
+        """
+        assert self.collection_is_completed
+
+        # Initial distribution already happened, reschedule on all nodes
+        if self.collection is not None:
+            for node in self.nodes:
+                self._reschedule(node)
+            return
+
+        # Check that all nodes collected the same tests
+        if not self._check_nodes_have_same_collection():
+            self.log("**Different tests collected, aborting run**")
+            return
+
+        # Collections are identical, create the final list of items
+        self.collection = list(next(iter(self.registered_collections.values())))
+        if not self.collection:
+            return
+
+        # Determine chunks of work (scopes)
+        for nodeid in self.collection:
+            scope = self._split_scope(nodeid)
+            work_unit = self.workqueue.setdefault(scope, default=OrderedDict())
+            work_unit[nodeid] = False
+
+        # Avoid having more workers than work
+        extra_nodes = len(self.nodes) - len(self.workqueue)
+
+        if extra_nodes > 0:
+            self.log("Shuting down {} nodes".format(extra_nodes))
+
+            for _ in range(extra_nodes):
+                unused_node, assigned = self.assigned_work.popitem(last=True)
+
+                self.log("Shuting down unused node {}".format(unused_node))
+                unused_node.shutdown()
+
+        # Assign initial workload
+        for node in self.nodes:
+            self._assign_work_unit(node)
+
+        # Ensure nodes start with at least two work units if possible (#277)
+        for node in self.nodes:
+            self._reschedule(node)
+
+        # Initial distribution sent all tests, start node shutdown
+        if not self.workqueue:
+            for node in self.nodes:
+                node.shutdown()
+
+    def _check_nodes_have_same_collection(self):
+        """Return True if all nodes have collected the same items.
+
+        If collections differ, this method returns False while logging
+        the collection differences and posting collection errors to
+        pytest_collectreport hook.
+        """
+        node_collection_items = list(self.registered_collections.items())
+        first_node, col = node_collection_items[0]
+        same_collection = True
+
+        for node, collection in node_collection_items[1:]:
+            msg = report_collection_diff(
+                col, collection, first_node.gateway.id, node.gateway.id
+            )
+            if not msg:
+                continue
+
+            same_collection = False
+            self.log(msg)
+
+            if self.config is None:
+                continue
+
+            rep = CollectReport(node.gateway.id, "failed", longrepr=msg, result=[])
+            self.config.hook.pytest_collectreport(report=rep)
+
+        return same_collection

src/xdist/workermanage.py

@@ -0,0 +1,430 @@
+import fnmatch
+import os
+import re
+import sys
+import uuid
+
+import py
+import pytest
+import execnet
+
+import xdist.remote
+
+
+def parse_spec_config(config):
+    xspeclist = []
+    for xspec in config.getvalue("tx"):
+        i = xspec.find("*")
+        try:
+            num = int(xspec[:i])
+        except ValueError:
+            xspeclist.append(xspec)
+        else:
+            xspeclist.extend([xspec[i + 1 :]] * num)
+    if not xspeclist:
+        raise pytest.UsageError(
+            "MISSING test execution (tx) nodes: please specify --tx"
+        )
+    return xspeclist
+
+
+class NodeManager:
+    EXIT_TIMEOUT = 10
+    DEFAULT_IGNORES = [".*", "*.pyc", "*.pyo", "*~"]
+
+    def __init__(self, config, specs=None, defaultchdir="pyexecnetcache"):
+        self.config = config
+        self.trace = self.config.trace.get("nodemanager")
+        self.testrunuid = self.config.getoption("testrunuid")
+        if self.testrunuid is None:
+            self.testrunuid = uuid.uuid4().hex
+        self.group = execnet.Group()
+        if specs is None:
+            specs = self._getxspecs()
+        self.specs = []
+        for spec in specs:
+            if not isinstance(spec, execnet.XSpec):
+                spec = execnet.XSpec(spec)
+            if not spec.chdir and not spec.popen:
+                spec.chdir = defaultchdir
+            self.group.allocate_id(spec)
+            self.specs.append(spec)
+        self.roots = self._getrsyncdirs()
+        self.rsyncoptions = self._getrsyncoptions()
+        self._rsynced_specs = set()
+
+    def rsync_roots(self, gateway):
+        """Rsync the set of roots to the node's gateway cwd."""
+        if self.roots:
+            for root in self.roots:
+                self.rsync(gateway, root, **self.rsyncoptions)
+
+    def setup_nodes(self, putevent):
+        self.config.hook.pytest_xdist_setupnodes(config=self.config, specs=self.specs)
+        self.trace("setting up nodes")
+        return [self.setup_node(spec, putevent) for spec in self.specs]
+
+    def setup_node(self, spec, putevent):
+        gw = self.group.makegateway(spec)
+        self.config.hook.pytest_xdist_newgateway(gateway=gw)
+        self.rsync_roots(gw)
+        node = WorkerController(self, gw, self.config, putevent)
+        gw.node = node  # keep the node alive
+        node.setup()
+        self.trace("started node %r" % node)
+        return node
+
+    def teardown_nodes(self):
+        self.group.terminate(self.EXIT_TIMEOUT)
+
+    def _getxspecs(self):
+        return [execnet.XSpec(x) for x in parse_spec_config(self.config)]
+
+    def _getrsyncdirs(self):
+        for spec in self.specs:
+            if not spec.popen or spec.chdir:
+                break
+        else:
+            return []
+        import pytest
+        import _pytest
+
+        def get_dir(p):
+            """Return the directory path if p is a package or the path to the .py file otherwise."""
+            stripped = p.rstrip("co")
+            if os.path.basename(stripped) == "__init__.py":
+                return os.path.dirname(p)
+            else:
+                return stripped
+
+        pytestpath = get_dir(pytest.__file__)
+        pytestdir = get_dir(_pytest.__file__)
+        config = self.config
+        candidates = [py._pydir, pytestpath, pytestdir]
+        candidates += config.option.rsyncdir
+        rsyncroots = config.getini("rsyncdirs")
+        if rsyncroots:
+            candidates.extend(rsyncroots)
+        roots = []
+        for root in candidates:
+            root = py.path.local(root).realpath()
+            if not root.check():
+                raise pytest.UsageError("rsyncdir doesn't exist: {!r}".format(root))
+            if root not in roots:
+                roots.append(root)
+        return roots
+
+    def _getrsyncoptions(self):
+        """Get options to be passed for rsync."""
+        ignores = list(self.DEFAULT_IGNORES)
+        ignores += self.config.option.rsyncignore
+        ignores += self.config.getini("rsyncignore")
+
+        return {
+            "ignores": ignores,
+            "verbose": getattr(self.config.option, "verbose", 0),
+        }
+
+    def rsync(self, gateway, source, notify=None, verbose=False, ignores=None):
+        """Perform rsync to remote hosts for node."""
+        # XXX This changes the calling behaviour of
+        #     pytest_xdist_rsyncstart and pytest_xdist_rsyncfinish to
+        #     be called once per rsync target.
+        rsync = HostRSync(source, verbose=verbose, ignores=ignores)
+        spec = gateway.spec
+        if spec.popen and not spec.chdir:
+            # XXX This assumes that sources are python-packages
+            #     and that adding the basedir does not hurt.
+            gateway.remote_exec(
+                """
+                import sys ; sys.path.insert(0, %r)
+            """
+                % os.path.dirname(str(source))
+            ).waitclose()
+            return
+        if (spec, source) in self._rsynced_specs:
+            return
+
+        def finished():
+            if notify:
+                notify("rsyncrootready", spec, source)
+
+        rsync.add_target_host(gateway, finished=finished)
+        self._rsynced_specs.add((spec, source))
+        self.config.hook.pytest_xdist_rsyncstart(source=source, gateways=[gateway])
+        rsync.send()
+        self.config.hook.pytest_xdist_rsyncfinish(source=source, gateways=[gateway])
+
+
+class HostRSync(execnet.RSync):
+    """ RSyncer that filters out common files
+    """
+
+    def __init__(self, sourcedir, *args, **kwargs):
+        self._synced = {}
+        ignores = kwargs.pop("ignores", None) or []
+        self._ignores = [
+            re.compile(fnmatch.translate(getattr(x, "strpath", x))) for x in ignores
+        ]
+        super().__init__(sourcedir=sourcedir, **kwargs)
+
+    def filter(self, path):
+        path = py.path.local(path)
+        for cre in self._ignores:
+            if cre.match(path.basename) or cre.match(path.strpath):
+                return False
+        else:
+            return True
+
+    def add_target_host(self, gateway, finished=None):
+        remotepath = os.path.basename(self._sourcedir)
+        super().add_target(gateway, remotepath, finishedcallback=finished, delete=True)
+
+    def _report_send_file(self, gateway, modified_rel_path):
+        if self._verbose > 0:
+            path = os.path.basename(self._sourcedir) + "/" + modified_rel_path
+            remotepath = gateway.spec.chdir
+            print("{}:{} <= {}".format(gateway.spec, remotepath, path))
+
+
+def make_reltoroot(roots, args):
+    # XXX introduce/use public API for splitting pytest args
+    splitcode = "::"
+    result = []
+    for arg in args:
+        parts = arg.split(splitcode)
+        fspath = py.path.local(parts[0])
+        if not fspath.exists():
+            result.append(arg)
+            continue
+        for root in roots:
+            x = fspath.relto(root)
+            if x or fspath == root:
+                parts[0] = root.basename + "/" + x
+                break
+        else:
+            raise ValueError("arg {} not relative to an rsync root".format(arg))
+        result.append(splitcode.join(parts))
+    return result
+
+
+class WorkerController:
+    ENDMARK = -1
+
+    class RemoteHook:
+        @pytest.mark.trylast
+        def pytest_xdist_getremotemodule(self):
+            return xdist.remote
+
+    def __init__(self, nodemanager, gateway, config, putevent):
+        config.pluginmanager.register(self.RemoteHook())
+        self.nodemanager = nodemanager
+        self.putevent = putevent
+        self.gateway = gateway
+        self.config = config
+        self.workerinput = {
+            "workerid": gateway.id,
+            "workercount": len(nodemanager.specs),
+            "testrunuid": nodemanager.testrunuid,
+            "mainargv": sys.argv,
+        }
+        self._down = False
+        self._shutdown_sent = False
+        self.log = py.log.Producer("workerctl-%s" % gateway.id)
+        if not self.config.option.debug:
+            py.log.setconsumer(self.log._keywords, None)
+
+    def __repr__(self):
+        return "<{} {}>".format(self.__class__.__name__, self.gateway.id)
+
+    @property
+    def shutting_down(self):
+        return self._down or self._shutdown_sent
+
+    def setup(self):
+        self.log("setting up worker session")
+        spec = self.gateway.spec
+        if hasattr(self.config, "invocation_params"):
+            args = [str(x) for x in self.config.invocation_params.args or ()]
+            option_dict = {}
+        else:
+            args = self.config.args
+            option_dict = vars(self.config.option)
+        if not spec.popen or spec.chdir:
+            args = make_reltoroot(self.nodemanager.roots, args)
+        if spec.popen:
+            name = "popen-%s" % self.gateway.id
+            if hasattr(self.config, "_tmpdirhandler"):
+                basetemp = self.config._tmpdirhandler.getbasetemp()
+                option_dict["basetemp"] = str(basetemp.join(name))
+        self.config.hook.pytest_configure_node(node=self)
+
+        remote_module = self.config.hook.pytest_xdist_getremotemodule()
+        self.channel = self.gateway.remote_exec(remote_module)
+        # change sys.path only for remote workers
+        change_sys_path = not self.gateway.spec.popen
+        self.channel.send((self.workerinput, args, option_dict, change_sys_path))
+
+        if self.putevent:
+            self.channel.setcallback(self.process_from_remote, endmarker=self.ENDMARK)
+
+    def ensure_teardown(self):
+        if hasattr(self, "channel"):
+            if not self.channel.isclosed():
+                self.log("closing", self.channel)
+                self.channel.close()
+            # del self.channel
+        if hasattr(self, "gateway"):
+            self.log("exiting", self.gateway)
+            self.gateway.exit()
+            # del self.gateway
+
+    def send_runtest_some(self, indices):
+        self.sendcommand("runtests", indices=indices)
+
+    def send_runtest_all(self):
+        self.sendcommand("runtests_all")
+
+    def shutdown(self):
+        if not self._down:
+            try:
+                self.sendcommand("shutdown")
+            except OSError:
+                pass
+            self._shutdown_sent = True
+
+    def sendcommand(self, name, **kwargs):
+        """ send a named parametrized command to the other side. """
+        self.log("sending command {}(**{})".format(name, kwargs))
+        self.channel.send((name, kwargs))
+
+    def notify_inproc(self, eventname, **kwargs):
+        self.log("queuing {}(**{})".format(eventname, kwargs))
+        self.putevent((eventname, kwargs))
+
+    def process_from_remote(self, eventcall):  # noqa too complex
+        """ this gets called for each object we receive from
+            the other side and if the channel closes.
+
+            Note that channel callbacks run in the receiver
+            thread of execnet gateways - we need to
+            avoid raising exceptions or doing heavy work.
+        """
+        try:
+            if eventcall == self.ENDMARK:
+                err = self.channel._getremoteerror()
+                if not self._down:
+                    if not err or isinstance(err, EOFError):
+                        err = "Not properly terminated"  # lost connection?
+                    self.notify_inproc("errordown", node=self, error=err)
+                    self._down = True
+                return
+            eventname, kwargs = eventcall
+            if eventname in ("collectionstart",):
+                self.log("ignoring {}({})".format(eventname, kwargs))
+            elif eventname == "workerready":
+                self.notify_inproc(eventname, node=self, **kwargs)
+            elif eventname == "internal_error":
+                self.notify_inproc(eventname, node=self, **kwargs)
+            elif eventname == "workerfinished":
+                self._down = True
+                self.workeroutput = kwargs["workeroutput"]
+                self.notify_inproc("workerfinished", node=self)
+            elif eventname in ("logstart", "logfinish"):
+                self.notify_inproc(eventname, node=self, **kwargs)
+            elif eventname in ("testreport", "collectreport", "teardownreport"):
+                item_index = kwargs.pop("item_index", None)
+                rep = self.config.hook.pytest_report_from_serializable(
+                    config=self.config, data=kwargs["data"]
+                )
+                if item_index is not None:
+                    rep.item_index = item_index
+                self.notify_inproc(eventname, node=self, rep=rep)
+            elif eventname == "collectionfinish":
+                self.notify_inproc(eventname, node=self, ids=kwargs["ids"])
+            elif eventname == "runtest_protocol_complete":
+                self.notify_inproc(eventname, node=self, **kwargs)
+            elif eventname == "logwarning":
+                self.notify_inproc(
+                    eventname,
+                    message=kwargs["message"],
+                    code=kwargs["code"],
+                    nodeid=kwargs["nodeid"],
+                    fslocation=kwargs["nodeid"],
+                )
+            elif eventname == "warning_captured":
+                warning_message = unserialize_warning_message(
+                    kwargs["warning_message_data"]
+                )
+                self.notify_inproc(
+                    eventname,
+                    warning_message=warning_message,
+                    when=kwargs["when"],
+                    item=kwargs["item"],
+                )
+            elif eventname == "warning_recorded":
+                warning_message = unserialize_warning_message(
+                    kwargs["warning_message_data"]
+                )
+                self.notify_inproc(
+                    eventname,
+                    warning_message=warning_message,
+                    when=kwargs["when"],
+                    nodeid=kwargs["nodeid"],
+                    location=kwargs["location"],
+                )
+            else:
+                raise ValueError("unknown event: {}".format(eventname))
+        except KeyboardInterrupt:
+            # should not land in receiver-thread
+            raise
+        except:  # noqa
+            from _pytest._code import ExceptionInfo
+
+            excinfo = ExceptionInfo.from_current()
+            print("!" * 20, excinfo)
+            self.config.notify_exception(excinfo)
+            self.shutdown()
+            self.notify_inproc("errordown", node=self, error=excinfo)
+
+
+def unserialize_warning_message(data):
+    import warnings
+    import importlib
+
+    if data["message_module"]:
+        mod = importlib.import_module(data["message_module"])
+        cls = getattr(mod, data["message_class_name"])
+        message = None
+        if data["message_args"] is not None:
+            try:
+                message = cls(*data["message_args"])
+            except TypeError:
+                pass
+        if message is None:
+            # could not recreate the original warning instance;
+            # create a generic Warning instance with the original
+            # message at least
+            message_text = "{mod}.{cls}: {msg}".format(
+                mod=data["message_module"],
+                cls=data["message_class_name"],
+                msg=data["message_str"],
+            )
+            message = Warning(message_text)
+    else:
+        message = data["message_str"]
+
+    if data["category_module"]:
+        mod = importlib.import_module(data["category_module"])
+        category = getattr(mod, data["category_class_name"])
+    else:
+        category = None
+
+    kwargs = {"message": message, "category": category}
+    # access private _WARNING_DETAILS because the attributes vary between Python versions
+    for attr_name in warnings.WarningMessage._WARNING_DETAILS:
+        if attr_name in ("message", "category"):
+            continue
+        kwargs[attr_name] = data[attr_name]
+
+    return warnings.WarningMessage(**kwargs)

testing/conftest.py

@@ -2,51 +2,39 @@ import py
 import pytest
 import execnet
 
-
-@pytest.fixture(scope="session", autouse=True)
-def _ensure_imports():
-    # we import some modules because pytest-2.8's testdir fixture
-    # will unload all modules after each test and this cause
-    # (unknown) problems with execnet.Group()
-    execnet.Group
-    execnet.makegateway
-
-
 pytest_plugins = "pytester"
 
-# rsyncdirs = ['.', '../xdist', py.path.local(execnet.__file__).dirpath()]
-
 
 @pytest.fixture(autouse=True)
 def _divert_atexit(request, monkeypatch):
     import atexit
-    l = []
 
-    def finish():
+    finalizers = []
-        while l:
-            l.pop()()
 
-    monkeypatch.setattr(atexit, "register", l.append)
+    def fake_register(func, *args, **kwargs):
-    request.addfinalizer(finish)
+        finalizers.append((func, args, kwargs))
+
+    monkeypatch.setattr(atexit, "register", fake_register)
+
+    yield
+
+    while finalizers:
+        func, args, kwargs = finalizers.pop()
+        func(*args, **kwargs)
 
 
 def pytest_addoption(parser):
-    parser.addoption('--gx',
+    parser.addoption(
-                     action="append",
+        "--gx",
-                     dest="gspecs",
+        action="append",
-                     help=("add a global test environment, XSpec-syntax. "))
+        dest="gspecs",
-
+        help="add a global test environment, XSpec-syntax. ",
-
+    )
-def pytest_funcarg__specssh(request):
-    return getspecssh(request.config)
 
 
 @pytest.fixture
-def testdir(testdir):
+def specssh(request):
-    # pytest before 2.8 did not have a runpytest_subprocess
+    return getspecssh(request.config)
-    if not hasattr(testdir, "runpytest_subprocess"):
-        testdir.runpytest_subprocess = testdir.runpytest
-    return testdir
 
 
 # configuration information for tests

testing/test_boxed.py

@@ -1,58 +0,0 @@
-import pytest
-import os
-
-needsfork = pytest.mark.skipif(not hasattr(os, "fork"),
-                               reason="os.fork required")
-
-
-@needsfork
-def test_functional_boxed(testdir):
-    p1 = testdir.makepyfile("""
-        import os
-        def test_function():
-            os.kill(os.getpid(), 15)
-    """)
-    result = testdir.runpytest(p1, "--boxed")
-    result.stdout.fnmatch_lines([
-        "*CRASHED*",
-        "*1 failed*"
-    ])
-
-
-@needsfork
-@pytest.mark.parametrize("capmode", [
-    "no",
-    pytest.mark.xfail("sys", reason="capture cleanup needed"),
-    pytest.mark.xfail("fd", reason="capture cleanup needed")])
-def test_functional_boxed_capturing(testdir, capmode):
-    p1 = testdir.makepyfile("""
-        import os
-        import sys
-        def test_function():
-            sys.stdout.write("hello\\n")
-            sys.stderr.write("world\\n")
-            os.kill(os.getpid(), 15)
-    """)
-    result = testdir.runpytest(p1, "--boxed", "--capture=%s" % capmode)
-    result.stdout.fnmatch_lines("""
-        *CRASHED*
-        *stdout*
-        hello
-        *stderr*
-        world
-        *1 failed*
-    """)
-
-
-class TestOptionEffects:
-    def test_boxed_option_default(self, testdir):
-        tmpdir = testdir.tmpdir.ensure("subdir", dir=1)
-        config = testdir.parseconfig()
-        assert not config.option.boxed
-        pytest.importorskip("execnet")
-        config = testdir.parseconfig('-d', tmpdir)
-        assert not config.option.boxed
-
-    def test_is_not_boxed_by_default(self, testdir):
-        config = testdir.parseconfig(testdir.tmpdir)
-        assert not config.option.boxed

testing/test_dsession.py

@@ -1,6 +1,7 @@
-from xdist.dsession import (
+from xdist.dsession import DSession, get_default_max_worker_restart
-    DSession, LoadScheduling, EachScheduling, report_collection_diff,
+from xdist.report import report_collection_diff
-)
+from xdist.scheduler import EachScheduling, LoadScheduling
+
 import py
 import pytest
 import execnet
@@ -49,80 +50,84 @@ def dumpqueue(queue):
 
 
 class TestEachScheduling:
-    def test_schedule_load_simple(self):
+    def test_schedule_load_simple(self, testdir):
         node1 = MockNode()
         node2 = MockNode()
-        sched = EachScheduling(2)
+        config = testdir.parseconfig("--tx=2*popen")
-        sched.addnode(node1)
+        sched = EachScheduling(config)
-        sched.addnode(node2)
+        sched.add_node(node1)
-        collection = ["a.py::test_1", ]
+        sched.add_node(node2)
+        collection = ["a.py::test_1"]
         assert not sched.collection_is_completed
-        sched.addnode_collection(node1, collection)
+        sched.add_node_collection(node1, collection)
         assert not sched.collection_is_completed
-        sched.addnode_collection(node2, collection)
+        sched.add_node_collection(node2, collection)
         assert sched.collection_is_completed
         assert sched.node2collection[node1] == collection
         assert sched.node2collection[node2] == collection
-        sched.init_distribute()
+        sched.schedule()
-        assert sched.tests_finished()
+        assert sched.tests_finished
-        assert node1.sent == ['ALL']
+        assert node1.sent == ["ALL"]
-        assert node2.sent == ['ALL']
+        assert node2.sent == ["ALL"]
-        sched.remove_item(node1, 0)
+        sched.mark_test_complete(node1, 0)
-        assert sched.tests_finished()
+        assert sched.tests_finished
-        sched.remove_item(node2, 0)
+        sched.mark_test_complete(node2, 0)
-        assert sched.tests_finished()
+        assert sched.tests_finished
 
-    def test_schedule_remove_node(self):
+    def test_schedule_remove_node(self, testdir):
         node1 = MockNode()
-        sched = EachScheduling(1)
+        config = testdir.parseconfig("--tx=popen")
-        sched.addnode(node1)
+        sched = EachScheduling(config)
-        collection = ["a.py::test_1", ]
+        sched.add_node(node1)
+        collection = ["a.py::test_1"]
         assert not sched.collection_is_completed
-        sched.addnode_collection(node1, collection)
+        sched.add_node_collection(node1, collection)
         assert sched.collection_is_completed
         assert sched.node2collection[node1] == collection
-        sched.init_distribute()
+        sched.schedule()
-        assert sched.tests_finished()
+        assert sched.tests_finished
         crashitem = sched.remove_node(node1)
         assert crashitem
-        assert sched.tests_finished()
+        assert sched.tests_finished
-        assert not sched.hasnodes()
+        assert not sched.nodes
 
 
 class TestLoadScheduling:
-    def test_schedule_load_simple(self):
+    def test_schedule_load_simple(self, testdir):
-        sched = LoadScheduling(2)
+        config = testdir.parseconfig("--tx=2*popen")
-        sched.addnode(MockNode())
+        sched = LoadScheduling(config)
-        sched.addnode(MockNode())
+        sched.add_node(MockNode())
+        sched.add_node(MockNode())
         node1, node2 = sched.nodes
         collection = ["a.py::test_1", "a.py::test_2"]
         assert not sched.collection_is_completed
-        sched.addnode_collection(node1, collection)
+        sched.add_node_collection(node1, collection)
         assert not sched.collection_is_completed
-        sched.addnode_collection(node2, collection)
+        sched.add_node_collection(node2, collection)
         assert sched.collection_is_completed
         assert sched.node2collection[node1] == collection
         assert sched.node2collection[node2] == collection
-        sched.init_distribute()
+        sched.schedule()
         assert not sched.pending
-        assert sched.tests_finished()
+        assert sched.tests_finished
         assert len(node1.sent) == 1
         assert len(node2.sent) == 1
         assert node1.sent == [0]
         assert node2.sent == [1]
-        sched.remove_item(node1, node1.sent[0])
+        sched.mark_test_complete(node1, node1.sent[0])
-        assert sched.tests_finished()
+        assert sched.tests_finished
 
-    def test_init_distribute_batch_size(self):
+    def test_schedule_batch_size(self, testdir):
-        sched = LoadScheduling(2)
+        config = testdir.parseconfig("--tx=2*popen")
-        sched.addnode(MockNode())
+        sched = LoadScheduling(config)
-        sched.addnode(MockNode())
+        sched.add_node(MockNode())
+        sched.add_node(MockNode())
         node1, node2 = sched.nodes
-        col = ["xyz"] * (6)
+        col = ["xyz"] * 6
-        sched.addnode_collection(node1, col)
+        sched.add_node_collection(node1, col)
-        sched.addnode_collection(node2, col)
+        sched.add_node_collection(node2, col)
-        sched.init_distribute()
+        sched.schedule()
-        # assert not sched.tests_finished()
+        # assert not sched.tests_finished
         sent1 = node1.sent
         sent2 = node2.sent
         assert sent1 == [0, 2]
@@ -131,25 +136,26 @@ class TestLoadScheduling:
         assert sched.node2pending[node1] == sent1
         assert sched.node2pending[node2] == sent2
         assert len(sched.pending) == 2
-        sched.remove_item(node1, 0)
+        sched.mark_test_complete(node1, 0)
         assert node1.sent == [0, 2, 4]
         assert sched.pending == [5]
         assert node2.sent == [1, 3]
-        sched.remove_item(node1, 2)
+        sched.mark_test_complete(node1, 2)
         assert node1.sent == [0, 2, 4, 5]
         assert not sched.pending
 
-    def test_init_distribute_fewer_tests_than_nodes(self):
+    def test_schedule_fewer_tests_than_nodes(self, testdir):
-        sched = LoadScheduling(2)
+        config = testdir.parseconfig("--tx=2*popen")
-        sched.addnode(MockNode())
+        sched = LoadScheduling(config)
-        sched.addnode(MockNode())
+        sched.add_node(MockNode())
-        sched.addnode(MockNode())
+        sched.add_node(MockNode())
+        sched.add_node(MockNode())
         node1, node2, node3 = sched.nodes
         col = ["xyz"] * 2
-        sched.addnode_collection(node1, col)
+        sched.add_node_collection(node1, col)
-        sched.addnode_collection(node2, col)
+        sched.add_node_collection(node2, col)
-        sched.init_distribute()
+        sched.schedule()
-        # assert not sched.tests_finished()
+        # assert not sched.tests_finished
         sent1 = node1.sent
         sent2 = node2.sent
         sent3 = node3.sent
@@ -158,17 +164,18 @@ class TestLoadScheduling:
         assert sent3 == []
         assert not sched.pending
 
-    def test_init_distribute_fewer_than_two_tests_per_node(self):
+    def test_schedule_fewer_than_two_tests_per_node(self, testdir):
-        sched = LoadScheduling(2)
+        config = testdir.parseconfig("--tx=2*popen")
-        sched.addnode(MockNode())
+        sched = LoadScheduling(config)
-        sched.addnode(MockNode())
+        sched.add_node(MockNode())
-        sched.addnode(MockNode())
+        sched.add_node(MockNode())
+        sched.add_node(MockNode())
         node1, node2, node3 = sched.nodes
         col = ["xyz"] * 5
-        sched.addnode_collection(node1, col)
+        sched.add_node_collection(node1, col)
-        sched.addnode_collection(node2, col)
+        sched.add_node_collection(node2, col)
-        sched.init_distribute()
+        sched.schedule()
-        # assert not sched.tests_finished()
+        # assert not sched.tests_finished
         sent1 = node1.sent
         sent2 = node2.sent
         sent3 = node3.sent
@@ -177,14 +184,15 @@ class TestLoadScheduling:
         assert sent3 == [2]
         assert not sched.pending
 
-    def test_add_remove_node(self):
+    def test_add_remove_node(self, testdir):
         node = MockNode()
-        sched = LoadScheduling(1)
+        config = testdir.parseconfig("--tx=popen")
-        sched.addnode(node)
+        sched = LoadScheduling(config)
+        sched.add_node(node)
         collection = ["test_file.py::test_func"]
-        sched.addnode_collection(node, collection)
+        sched.add_node_collection(node, collection)
         assert sched.collection_is_completed
-        sched.init_distribute()
+        sched.schedule()
         assert not sched.pending
         crashitem = sched.remove_node(node)
         assert crashitem == collection[0]
@@ -192,10 +200,10 @@ class TestLoadScheduling:
     def test_different_tests_collected(self, testdir):
         """
         Test that LoadScheduling is reporting collection errors when
-        different test ids are collected by slaves.
+        different test ids are collected by workers.
         """
 
-        class CollectHook(object):
+        class CollectHook:
             """
             Dummy hook that stores collection reports.
             """
@@ -207,19 +215,19 @@ class TestLoadScheduling:
                 self.reports.append(report)
 
         collect_hook = CollectHook()
-        config = testdir.parseconfig()
+        config = testdir.parseconfig("--tx=2*popen")
         config.pluginmanager.register(collect_hook, "collect_hook")
         node1 = MockNode()
         node2 = MockNode()
-        sched = LoadScheduling(2, config=config)
+        sched = LoadScheduling(config)
-        sched.addnode(node1)
+        sched.add_node(node1)
-        sched.addnode(node2)
+        sched.add_node(node2)
-        sched.addnode_collection(node1, ["a.py::test_1"])
+        sched.add_node_collection(node1, ["a.py::test_1"])
-        sched.addnode_collection(node2, ["a.py::test_2"])
+        sched.add_node_collection(node2, ["a.py::test_2"])
-        sched.init_distribute()
+        sched.schedule()
         assert len(collect_hook.reports) == 1
         rep = collect_hook.reports[0]
-        assert 'Different tests were collected between' in rep.longrepr
+        assert "Different tests were collected between" in rep.longrepr
 
 
 class TestDistReporter:
@@ -227,6 +235,7 @@ class TestDistReporter:
     def test_rsync_printing(self, testdir, linecomp):
         config = testdir.parseconfig()
         from _pytest.pytest_terminal import TerminalReporter
+
         rep = TerminalReporter(config, file=linecomp.stringio)
         config.pluginmanager.register(rep, "terminalreporter")
         dsession = DSession(config)
@@ -238,6 +247,7 @@ class TestDistReporter:
         class gw2:
             id = "X2"
             spec = execnet.XSpec("popen")
+
         # class rinfo:
         #    version_info = (2, 5, 1, 'final', 0)
         #    executable = "hello"
@@ -249,47 +259,68 @@ class TestDistReporter:
         #     "*X1*popen*xyz*2.5*"
         # ])
         dsession.pytest_xdist_rsyncstart(source="hello", gateways=[gw1, gw2])
-        linecomp.assert_contains_lines(["[X1,X2] rsyncing: hello", ])
+        linecomp.assert_contains_lines(["[X1,X2] rsyncing: hello"])
 
 
 def test_report_collection_diff_equal():
     """Test reporting of equal collections."""
-    from_collection = to_collection = ['aaa', 'bbb', 'ccc']
+    from_collection = to_collection = ["aaa", "bbb", "ccc"]
     assert report_collection_diff(from_collection, to_collection, 1, 2) is None
 
 
+def test_default_max_worker_restart():
+    class config:
+        class option:
+            maxworkerrestart = None
+            numprocesses = 0
+
+    assert get_default_max_worker_restart(config) is None
+
+    config.option.numprocesses = 2
+    assert get_default_max_worker_restart(config) == 8
+
+    config.option.maxworkerrestart = "1"
+    assert get_default_max_worker_restart(config) == 1
+
+    config.option.maxworkerrestart = "0"
+    assert get_default_max_worker_restart(config) == 0
+
+
 def test_report_collection_diff_different():
     """Test reporting of different collections."""
-    from_collection = ['aaa', 'bbb', 'ccc', 'YYY']
+    from_collection = ["aaa", "bbb", "ccc", "YYY"]
-    to_collection = ['aZa', 'bbb', 'XXX', 'ccc']
+    to_collection = ["aZa", "bbb", "XXX", "ccc"]
     error_message = (
-        'Different tests were collected between 1 and 2. The difference is:\n'
+        "Different tests were collected between 1 and 2. The difference is:\n"
-        '--- 1\n'
+        "--- 1\n"
-        '\n'
+        "\n"
-        '+++ 2\n'
+        "+++ 2\n"
-        '\n'
+        "\n"
-        '@@ -1,4 +1,4 @@\n'
+        "@@ -1,4 +1,4 @@\n"
-        '\n'
+        "\n"
-        '-aaa\n'
+        "-aaa\n"
-        '+aZa\n'
+        "+aZa\n"
-        ' bbb\n'
+        " bbb\n"
-        '+XXX\n'
+        "+XXX\n"
-        ' ccc\n'
+        " ccc\n"
-        '-YYY')
+        "-YYY"
+    )
 
-    msg = report_collection_diff(from_collection, to_collection, '1', '2')
+    msg = report_collection_diff(from_collection, to_collection, "1", "2")
     assert msg == error_message
 
 
 @pytest.mark.xfail(reason="duplicate test ids not supported yet")
 def test_pytest_issue419(testdir):
-    testdir.makepyfile("""
+    testdir.makepyfile(
+        """
         import pytest
 
         @pytest.mark.parametrize('birth_year', [1988, 1988, ])
         def test_2011_table(birth_year):
             pass
-    """)
+    """
+    )
     reprec = testdir.inline_run("-n1")
     reprec.assertoutcome(passed=2)
     assert 0

testing/test_looponfail.py

@@ -1,4 +1,7 @@
 import py
+import pytest
+from pkg_resources import parse_version
+
 from xdist.looponfail import RemoteControl
 from xdist.looponfail import StatRecorder
 
@@ -60,7 +63,7 @@ class TestStatRecorder:
         p.remove()
         # make check()'s visit() call return our just removed
         # path as if we were in a race condition
-        monkeypatch.setattr(tmp, 'visit', lambda *args: [p])
+        monkeypatch.setattr(tmp, "visit", lambda *args: [p])
 
         changed = sd.check()
         assert changed
@@ -83,10 +86,10 @@ class TestStatRecorder:
         tmp = tmpdir
         sd = StatRecorder([tmp])
 
-        l = [True, False]
+        ret_values = [True, False]
-        monkeypatch.setattr(StatRecorder, 'check', lambda self: l.pop())
+        monkeypatch.setattr(StatRecorder, "check", lambda self: ret_values.pop())
         sd.waitonchange(checkinterval=0.2)
-        assert not l
+        assert not ret_values
 
 
 class TestRemoteControl:
@@ -110,19 +113,25 @@ class TestRemoteControl:
         assert not failures
 
     def test_failure_change(self, testdir):
-        modcol = testdir.getitem("""
+        modcol = testdir.getitem(
+            """
             def test_func():
                 assert 0
-        """)
+        """
+        )
         control = RemoteControl(modcol.config)
         control.loop_once()
         assert control.failures
-        modcol.fspath.write(py.code.Source("""
+        modcol.fspath.write(
+            py.code.Source(
+                """
             def test_func():
                 assert 1
             def test_new():
                 assert 0
-        """))
+        """
+            )
+        )
         removepyc(modcol.fspath)
         control.loop_once()
         assert not control.failures
@@ -131,14 +140,17 @@ class TestRemoteControl:
         assert str(control.failures).find("test_new") != -1
 
     def test_failure_subdir_no_init(self, testdir):
-        modcol = testdir.getitem("""
+        modcol = testdir.getitem(
+            """
             def test_func():
                 assert 0
-        """)
+        """
+        )
         parent = modcol.fspath.dirpath().dirpath()
         parent.chdir()
-        modcol.config.args = [py.path.local(x).relto(parent)
+        modcol.config.args = [
-                              for x in modcol.config.args]
+            py.path.local(x).relto(parent) for x in modcol.config.args
+        ]
         control = RemoteControl(modcol.config)
         control.loop_once()
         assert control.failures
@@ -148,68 +160,91 @@ class TestRemoteControl:
 
 class TestLooponFailing:
     def test_looponfail_from_fail_to_ok(self, testdir):
-        modcol = testdir.getmodulecol("""
+        modcol = testdir.getmodulecol(
+            """
             def test_one():
                 x = 0
                 assert x == 1
             def test_two():
                 assert 1
-        """)
+        """
+        )
         remotecontrol = RemoteControl(modcol.config)
         remotecontrol.loop_once()
         assert len(remotecontrol.failures) == 1
 
-        modcol.fspath.write(py.code.Source("""
+        modcol.fspath.write(
+            py.code.Source(
+                """
             def test_one():
                 assert 1
             def test_two():
                 assert 1
-        """))
+        """
+            )
+        )
         removepyc(modcol.fspath)
         remotecontrol.loop_once()
         assert not remotecontrol.failures
 
     def test_looponfail_from_one_to_two_tests(self, testdir):
-        modcol = testdir.getmodulecol("""
+        modcol = testdir.getmodulecol(
+            """
             def test_one():
                 assert 0
-        """)
+        """
+        )
         remotecontrol = RemoteControl(modcol.config)
         remotecontrol.loop_once()
         assert len(remotecontrol.failures) == 1
-        assert 'test_one' in remotecontrol.failures[0]
+        assert "test_one" in remotecontrol.failures[0]
 
-        modcol.fspath.write(py.code.Source("""
+        modcol.fspath.write(
+            py.code.Source(
+                """
             def test_one():
                 assert 1 # passes now
             def test_two():
                 assert 0 # new and fails
-        """))
+        """
+            )
+        )
         removepyc(modcol.fspath)
         remotecontrol.loop_once()
         assert len(remotecontrol.failures) == 0
         remotecontrol.loop_once()
         assert len(remotecontrol.failures) == 1
-        assert 'test_one' not in remotecontrol.failures[0]
+        assert "test_one" not in remotecontrol.failures[0]
-        assert 'test_two' in remotecontrol.failures[0]
+        assert "test_two" in remotecontrol.failures[0]
 
+    @pytest.mark.xfail(
+        parse_version(pytest.__version__) >= parse_version("3.1"),
+        reason="broken by pytest 3.1+",
+        strict=True,
+    )
     def test_looponfail_removed_test(self, testdir):
-        modcol = testdir.getmodulecol("""
+        modcol = testdir.getmodulecol(
+            """
             def test_one():
                 assert 0
             def test_two():
                 assert 0
-        """)
+        """
+        )
         remotecontrol = RemoteControl(modcol.config)
         remotecontrol.loop_once()
         assert len(remotecontrol.failures) == 2
 
-        modcol.fspath.write(py.code.Source("""
+        modcol.fspath.write(
+            py.code.Source(
+                """
             def test_xxx(): # renamed test
                 assert 0
             def test_two():
                 assert 1 # pass now
-        """))
+        """
+            )
+        )
         removepyc(modcol.fspath)
         remotecontrol.loop_once()
         assert len(remotecontrol.failures) == 0
@@ -218,10 +253,12 @@ class TestLooponFailing:
         assert len(remotecontrol.failures) == 1
 
     def test_looponfail_multiple_errors(self, testdir, monkeypatch):
-        modcol = testdir.getmodulecol("""
+        modcol = testdir.getmodulecol(
+            """
             def test_one():
                 assert 0
-        """)
+        """
+        )
         remotecontrol = RemoteControl(modcol.config)
         orig_runsession = remotecontrol.runsession
 
@@ -231,44 +268,52 @@ class TestLooponFailing:
             print(failures)
             return failures * 2, reports, collection_failed
 
-        monkeypatch.setattr(remotecontrol, 'runsession', runsession_dups)
+        monkeypatch.setattr(remotecontrol, "runsession", runsession_dups)
         remotecontrol.loop_once()
         assert len(remotecontrol.failures) == 1
 
 
 class TestFunctional:
     def test_fail_to_ok(self, testdir):
-        p = testdir.makepyfile("""
+        p = testdir.makepyfile(
+            """
             def test_one():
                 x = 0
                 assert x == 1
-        """)
+        """
+        )
         # p = testdir.mkdir("sub").join(p1.basename)
         # p1.move(p)
-        child = testdir.spawn_pytest("-f %s --traceconfig" % p)
+        child = testdir.spawn_pytest("-f %s --traceconfig" % p, expect_timeout=30.0)
         child.expect("def test_one")
         child.expect("x == 1")
         child.expect("1 failed")
         child.expect("### LOOPONFAILING ####")
         child.expect("waiting for changes")
-        p.write(py.code.Source("""
+        p.write(
+            py.code.Source(
+                """
             def test_one():
                 x = 1
                 assert x == 1
-        """))
+        """
+            )
+        )
         child.expect(".*1 passed.*")
         child.kill(15)
 
     def test_xfail_passes(self, testdir):
-        p = testdir.makepyfile("""
+        p = testdir.makepyfile(
+            """
             import py
             @py.test.mark.xfail
             def test_one():
                 pass
-        """)
+        """
-        child = testdir.spawn_pytest("-f %s" % p)
+        )
+        child = testdir.spawn_pytest("-f %s" % p, expect_timeout=30.0)
         child.expect("1 xpass")
-        child.expect("### LOOPONFAILING ####")
+        # child.expect("### LOOPONFAILING ####")
         child.expect("waiting for changes")
         child.kill(15)
 

testing/test_newhooks.py

@@ -2,49 +2,62 @@ import pytest
 
 
 class TestHooks:
-
     @pytest.fixture(autouse=True)
     def create_test_file(self, testdir):
-        testdir.makepyfile("""
+        testdir.makepyfile(
+            """
             import os
             def test_a(): pass
             def test_b(): pass
             def test_c(): pass
-        """)
+        """
+        )
 
     def test_runtest_logreport(self, testdir):
         """Test that log reports from pytest_runtest_logreport when running
-        with xdist contain a "node" attribute. (#8)
+        with xdist contain "node", "nodeid", "worker_id", and "testrun_uid" attributes. (#8)
         """
-        testdir.makeconftest("""
+        testdir.makeconftest(
+            """
             def pytest_runtest_logreport(report):
                 if hasattr(report, 'node'):
-                    slaveid = report.node.slaveinput['slaveid']
                     if report.when == "call":
-                        print("HOOK: %s %s" % (report.nodeid, slaveid))
+                        workerid = report.node.workerinput['workerid']
-        """)
+                        testrunuid = report.node.workerinput['testrunuid']
-        res = testdir.runpytest('-n1', '-s')
+                        if workerid != report.worker_id:
-        res.stdout.fnmatch_lines([
+                            print("HOOK: Worker id mismatch: %s %s"
-            '*HOOK: test_runtest_logreport.py::test_a gw0*',
+                                   % (workerid, report.worker_id))
-            '*HOOK: test_runtest_logreport.py::test_b gw0*',
+                        elif testrunuid != report.testrun_uid:
-            '*HOOK: test_runtest_logreport.py::test_c gw0*',
+                            print("HOOK: Testrun uid mismatch: %s %s"
-            '*3 passed*',
+                                   % (testrunuid, report.testrun_uid))
-        ])
+                        else:
+                            print("HOOK: %s %s %s"
+                                   % (report.nodeid, report.worker_id, report.testrun_uid))
+        """
+        )
+        res = testdir.runpytest("-n1", "-s")
+        res.stdout.fnmatch_lines(
+            [
+                "*HOOK: test_runtest_logreport.py::test_a gw0 *",
+                "*HOOK: test_runtest_logreport.py::test_b gw0 *",
+                "*HOOK: test_runtest_logreport.py::test_c gw0 *",
+                "*3 passed*",
+            ]
+        )
 
     def test_node_collection_finished(self, testdir):
         """Test pytest_xdist_node_collection_finished hook (#8).
         """
-        testdir.makeconftest("""
+        testdir.makeconftest(
+            """
             def pytest_xdist_node_collection_finished(node, ids):
-                slaveid = node.slaveinput['slaveid']
+                workerid = node.workerinput['workerid']
                 stripped_ids = [x.split('::')[1] for x in ids]
-                print("HOOK: %s %s" % (slaveid, ', '.join(stripped_ids)))
+                print("HOOK: %s %s" % (workerid, ', '.join(stripped_ids)))
-        """)
+        """
-        res = testdir.runpytest('-n2', '-s')
+        )
-        res.stdout.fnmatch_lines_random([
+        res = testdir.runpytest("-n2", "-s")
-            '*HOOK: gw0 test_a, test_b, test_c',
+        res.stdout.fnmatch_lines_random(
-            '*HOOK: gw1 test_a, test_b, test_c',
+            ["*HOOK: gw0 test_a, test_b, test_c", "*HOOK: gw1 test_a, test_b, test_c"]
-        ])
+        )
-        res.stdout.fnmatch_lines([
+        res.stdout.fnmatch_lines(["*3 passed*"])
-            '*3 passed*',
-        ])

testing/test_plugin.py

@@ -1,6 +1,10 @@
+from contextlib import suppress
+
 import py
 import execnet
-from xdist.slavemanage import NodeManager
+from xdist.workermanage import NodeManager
+
+import pytest
 
 
 def test_dist_incompatibility_messages(testdir):
@@ -16,24 +20,129 @@ def test_dist_incompatibility_messages(testdir):
 
 def test_dist_options(testdir):
     from xdist.plugin import pytest_cmdline_main as check_options
+
     config = testdir.parseconfigure("-n 2")
     check_options(config)
     assert config.option.dist == "load"
-    assert config.option.tx == ['popen'] * 2
+    assert config.option.tx == ["popen"] * 2
+    config = testdir.parseconfigure("--numprocesses", "2")
+    check_options(config)
+    assert config.option.dist == "load"
+    assert config.option.tx == ["popen"] * 2
+    config = testdir.parseconfigure("--numprocesses", "3", "--maxprocesses", "2")
+    check_options(config)
+    assert config.option.dist == "load"
+    assert config.option.tx == ["popen"] * 2
     config = testdir.parseconfigure("-d")
     check_options(config)
     assert config.option.dist == "load"
 
 
 def test_auto_detect_cpus(testdir, monkeypatch):
-    import multiprocessing
+    import os
-    monkeypatch.setattr(multiprocessing, 'cpu_count', lambda: 99)
+    from xdist.plugin import pytest_cmdline_main as check_options
+
+    with suppress(ImportError):
+        import psutil
+
+        monkeypatch.setattr(psutil, "cpu_count", lambda logical=True: None)
+
+    if hasattr(os, "sched_getaffinity"):
+        monkeypatch.setattr(os, "sched_getaffinity", lambda _pid: set(range(99)))
+    elif hasattr(os, "cpu_count"):
+        monkeypatch.setattr(os, "cpu_count", lambda: 99)
+    else:
+        import multiprocessing
+
+        monkeypatch.setattr(multiprocessing, "cpu_count", lambda: 99)
 
     config = testdir.parseconfigure("-n2")
-    assert config.getoption('numprocesses') == 2
+    assert config.getoption("numprocesses") == 2
 
     config = testdir.parseconfigure("-nauto")
-    assert config.getoption('numprocesses') == 99
+    check_options(config)
+    assert config.getoption("numprocesses") == 99
+
+    config = testdir.parseconfigure("-nauto", "--pdb")
+    check_options(config)
+    assert config.getoption("usepdb")
+    assert config.getoption("numprocesses") == 0
+    assert config.getoption("dist") == "no"
+
+    monkeypatch.delattr(os, "sched_getaffinity", raising=False)
+    monkeypatch.setenv("TRAVIS", "true")
+    config = testdir.parseconfigure("-nauto")
+    check_options(config)
+    assert config.getoption("numprocesses") == 2
+
+
+def test_auto_detect_cpus_psutil(testdir, monkeypatch):
+    from xdist.plugin import pytest_cmdline_main as check_options
+
+    psutil = pytest.importorskip("psutil")
+
+    monkeypatch.setattr(psutil, "cpu_count", lambda logical=True: 42)
+
+    config = testdir.parseconfigure("-nauto")
+    check_options(config)
+    assert config.getoption("numprocesses") == 42
+
+
+def test_hook_auto_num_workers(testdir, monkeypatch):
+    from xdist.plugin import pytest_cmdline_main as check_options
+
+    testdir.makeconftest(
+        """
+        def pytest_xdist_auto_num_workers():
+            return 42
+    """
+    )
+    config = testdir.parseconfigure("-nauto")
+    check_options(config)
+    assert config.getoption("numprocesses") == 42
+
+
+def test_boxed_with_collect_only(testdir):
+    from xdist.plugin import pytest_cmdline_main as check_options
+
+    config = testdir.parseconfigure("-n1", "--boxed")
+    check_options(config)
+    assert config.option.forked
+
+    config = testdir.parseconfigure("-n1", "--collect-only")
+    check_options(config)
+    assert not config.option.forked
+
+    config = testdir.parseconfigure("-n1", "--boxed", "--collect-only")
+    check_options(config)
+    assert config.option.forked
+
+
+def test_dsession_with_collect_only(testdir):
+    from xdist.plugin import pytest_cmdline_main as check_options
+    from xdist.plugin import pytest_configure as configure
+
+    config = testdir.parseconfigure("-n1")
+    check_options(config)
+    configure(config)
+    assert config.pluginmanager.hasplugin("dsession")
+
+    config = testdir.parseconfigure("-n1", "--collect-only")
+    check_options(config)
+    configure(config)
+    assert not config.pluginmanager.hasplugin("dsession")
+
+
+def test_testrunuid_provided(testdir):
+    config = testdir.parseconfigure("--testrunuid", "test123", "--tx=popen")
+    nm = NodeManager(config)
+    assert nm.testrunuid == "test123"
+
+
+def test_testrunuid_generated(testdir):
+    config = testdir.parseconfigure("--tx=popen")
+    nm = NodeManager(config)
+    assert len(nm.testrunuid) == 32
 
 
 class TestDistOptions:
@@ -47,13 +156,13 @@ class TestDistOptions:
         assert xspecs[1].ssh == "xyz"
 
     def test_xspecs_multiplied(self, testdir):
-        config = testdir.parseconfigure("--tx=3*popen", )
+        config = testdir.parseconfigure("--tx=3*popen")
         xspecs = NodeManager(config)._getxspecs()
         assert len(xspecs) == 3
         assert xspecs[1].popen
 
     def test_getrsyncdirs(self, testdir):
-        config = testdir.parseconfigure('--rsyncdir=' + str(testdir.tmpdir))
+        config = testdir.parseconfigure("--rsyncdir=" + str(testdir.tmpdir))
         nm = NodeManager(config, specs=[execnet.XSpec("popen")])
         assert not nm._getrsyncdirs()
         nm = NodeManager(config, specs=[execnet.XSpec("popen//chdir=qwe")])
@@ -61,23 +170,24 @@ class TestDistOptions:
         assert testdir.tmpdir in nm.roots
 
     def test_getrsyncignore(self, testdir):
-        config = testdir.parseconfigure('--rsyncignore=fo*')
+        config = testdir.parseconfigure("--rsyncignore=fo*")
         nm = NodeManager(config, specs=[execnet.XSpec("popen//chdir=qwe")])
-        assert 'fo*' in nm.rsyncoptions['ignores']
+        assert "fo*" in nm.rsyncoptions["ignores"]
 
     def test_getrsyncdirs_with_conftest(self, testdir):
         p = py.path.local()
-        for bn in 'x y z'.split():
+        for bn in "x y z".split():
             p.mkdir(bn)
-        testdir.makeini("""
+        testdir.makeini(
+            """
             [pytest]
             rsyncdirs= x
-        """)
+        """
-        config = testdir.parseconfigure(
+        )
-            testdir.tmpdir, '--rsyncdir=y', '--rsyncdir=z')
+        config = testdir.parseconfigure(testdir.tmpdir, "--rsyncdir=y", "--rsyncdir=z")
         nm = NodeManager(config, specs=[execnet.XSpec("popen//chdir=xyz")])
         roots = nm._getrsyncdirs()
         # assert len(roots) == 3 + 1 # pylib
-        assert py.path.local('y') in roots
+        assert py.path.local("y") in roots
-        assert py.path.local('z') in roots
+        assert py.path.local("z") in roots
-        assert testdir.tmpdir.join('x') in roots
+        assert testdir.tmpdir.join("x") in roots

testing/test_remote.py

@@ -1,10 +1,15 @@
 import py
-from xdist.slavemanage import SlaveController, unserialize_report
+import pprint
-from xdist.remote import serialize_report
+import pytest
+import sys
+import uuid
+
+from xdist.workermanage import WorkerController
 import execnet
-queue = py.builtin._tryimport("queue", "Queue")
 import marshal
 
+from queue import Queue
+
 WAIT_TIMEOUT = 10.0
 
 
@@ -12,7 +17,7 @@ def check_marshallable(d):
     try:
         marshal.dumps(d)
     except ValueError:
-        py.std.pprint.pprint(d)
+        pprint.pprint(d)
         raise ValueError("not marshallable")
 
 
@@ -21,24 +26,29 @@ class EventCall:
         self.name, self.kwargs = eventcall
 
     def __str__(self):
-        return "<EventCall %s(**%s)>" % (self.name, self.kwargs)
+        return "<EventCall {}(**{})>".format(self.name, self.kwargs)
 
 
-class SlaveSetup:
+class WorkerSetup:
     use_callback = False
 
-    def __init__(self, request):
+    def __init__(self, request, testdir):
-        self.testdir = request.getfuncargvalue("testdir")
         self.request = request
-        self.events = queue.Queue()
+        self.testdir = testdir
+        self.events = Queue()
 
-    def setup(self, ):
+    def setup(self,):
         self.testdir.chdir()
         # import os ; os.environ['EXECNET_DEBUG'] = "2"
         self.gateway = execnet.makegateway()
         self.config = config = self.testdir.parseconfigure()
         putevent = self.use_callback and self.events.put or None
-        self.slp = SlaveController(None, self.gateway, config, putevent)
+
+        class DummyMananger:
+            testrunuid = uuid.uuid4().hex
+            specs = [0, 1]
+
+        self.slp = WorkerController(DummyMananger, self.gateway, config, putevent)
         self.request.addfinalizer(self.slp.ensure_teardown)
         self.slp.setup()
 
@@ -51,203 +61,232 @@ class SlaveSetup:
             ev = EventCall(data)
             if name is None or ev.name == name:
                 return ev
-            print("skipping %s" % (ev, ))
+            print("skipping {}".format(ev))
 
     def sendcommand(self, name, **kwargs):
         self.slp.sendcommand(name, **kwargs)
 
 
-def pytest_funcarg__slave(request):
+@pytest.fixture
-    return SlaveSetup(request)
+def worker(request, testdir):
+    return WorkerSetup(request, testdir)
 
 
+@pytest.mark.xfail(reason="#59")
 def test_remoteinitconfig(testdir):
     from xdist.remote import remote_initconfig
+
     config1 = testdir.parseconfig()
     config2 = remote_initconfig(config1.option.__dict__, config1.args)
     assert config2.option.__dict__ == config1.option.__dict__
     assert config2.pluginmanager.getplugin("terminal") in (-1, None)
 
 
-class TestReportSerialization:
+class TestWorkerInteractor:
-    def test_itemreport_outcomes(self, testdir):
+    @pytest.fixture
-        reprec = testdir.inline_runsource("""
+    def unserialize_report(self, pytestconfig):
-            import py
+        def unserialize(data):
-            def test_pass(): pass
+            return pytestconfig.hook.pytest_report_from_serializable(
-            def test_fail(): 0/0
+                config=pytestconfig, data=data
-            @py.test.mark.skipif("True")
+            )
-            def test_skip(): pass
-            def test_skip_imperative():
-                py.test.skip("hello")
-            @py.test.mark.xfail("True")
-            def test_xfail(): 0/0
-            def test_xfail_imperative():
-                py.test.xfail("hello")
-        """)
-        reports = reprec.getreports("pytest_runtest_logreport")
-        assert len(reports) == 17  # with setup/teardown "passed" reports
-        for rep in reports:
-            d = serialize_report(rep)
-            check_marshallable(d)
-            newrep = unserialize_report("testreport", d)
-            assert newrep.passed == rep.passed
-            assert newrep.failed == rep.failed
-            assert newrep.skipped == rep.skipped
-            if newrep.skipped and not hasattr(newrep, "wasxfail"):
-                assert len(newrep.longrepr) == 3
-            assert newrep.outcome == rep.outcome
-            assert newrep.when == rep.when
-            assert newrep.keywords == rep.keywords
-            if rep.failed:
-                assert newrep.longrepr == str(rep.longrepr)
 
-    def test_collectreport_passed(self, testdir):
+        return unserialize
-        reprec = testdir.inline_runsource("def test_func(): pass")
-        reports = reprec.getreports("pytest_collectreport")
-        for rep in reports:
-            d = serialize_report(rep)
-            check_marshallable(d)
-            newrep = unserialize_report("collectreport", d)
-            assert newrep.passed == rep.passed
-            assert newrep.failed == rep.failed
-            assert newrep.skipped == rep.skipped
 
-    def test_collectreport_fail(self, testdir):
+    def test_basic_collect_and_runtests(self, worker, unserialize_report):
-        reprec = testdir.inline_runsource("qwe abc")
+        worker.testdir.makepyfile(
-        reports = reprec.getreports("pytest_collectreport")
+            """
-        assert reports
-        for rep in reports:
-            d = serialize_report(rep)
-            check_marshallable(d)
-            newrep = unserialize_report("collectreport", d)
-            assert newrep.passed == rep.passed
-            assert newrep.failed == rep.failed
-            assert newrep.skipped == rep.skipped
-            if rep.failed:
-                assert newrep.longrepr == str(rep.longrepr)
-
-    def test_extended_report_deserialization(self, testdir):
-        reprec = testdir.inline_runsource("qwe abc")
-        reports = reprec.getreports("pytest_collectreport")
-        assert reports
-        for rep in reports:
-            rep.extra = True
-            d = serialize_report(rep)
-            check_marshallable(d)
-            newrep = unserialize_report("collectreport", d)
-            assert newrep.extra
-            assert newrep.passed == rep.passed
-            assert newrep.failed == rep.failed
-            assert newrep.skipped == rep.skipped
-            if rep.failed:
-                assert newrep.longrepr == str(rep.longrepr)
-
-
-class TestSlaveInteractor:
-    def test_basic_collect_and_runtests(self, slave):
-        slave.testdir.makepyfile("""
             def test_func():
                 pass
-        """)
+        """
-        slave.setup()
+        )
-        ev = slave.popevent()
+        worker.setup()
-        assert ev.name == "slaveready"
+        ev = worker.popevent()
-        ev = slave.popevent()
+        assert ev.name == "workerready"
+        ev = worker.popevent()
         assert ev.name == "collectionstart"
         assert not ev.kwargs
-        ev = slave.popevent("collectionfinish")
+        ev = worker.popevent("collectionfinish")
-        assert ev.kwargs['topdir'] == slave.testdir.tmpdir
+        assert ev.kwargs["topdir"] == worker.testdir.tmpdir
-        ids = ev.kwargs['ids']
+        ids = ev.kwargs["ids"]
         assert len(ids) == 1
-        slave.sendcommand("runtests", indices=list(range(len(ids))))
+        worker.sendcommand("runtests", indices=list(range(len(ids))))
-        slave.sendcommand("shutdown")
+        worker.sendcommand("shutdown")
-        ev = slave.popevent("logstart")
+        ev = worker.popevent("logstart")
         assert ev.kwargs["nodeid"].endswith("test_func")
         assert len(ev.kwargs["location"]) == 3
-        ev = slave.popevent("testreport")  # setup
+        ev = worker.popevent("testreport")  # setup
-        ev = slave.popevent("testreport")
+        ev = worker.popevent("testreport")
         assert ev.name == "testreport"
-        rep = unserialize_report(ev.name, ev.kwargs['data'])
+        rep = unserialize_report(ev.kwargs["data"])
         assert rep.nodeid.endswith("::test_func")
         assert rep.passed
         assert rep.when == "call"
-        ev = slave.popevent("slavefinished")
+        ev = worker.popevent("workerfinished")
-        assert 'slaveoutput' in ev.kwargs
+        assert "workeroutput" in ev.kwargs
 
-    def test_remote_collect_skip(self, slave):
+    def test_remote_collect_skip(self, worker, unserialize_report):
-        slave.testdir.makepyfile("""
+        worker.testdir.makepyfile(
-            import py
+            """
-            py.test.skip("hello")
+            import pytest
-        """)
+            pytest.skip("hello", allow_module_level=True)
-        slave.setup()
+        """
-        ev = slave.popevent("collectionstart")
+        )
+        worker.setup()
+        ev = worker.popevent("collectionstart")
         assert not ev.kwargs
-        ev = slave.popevent()
+        ev = worker.popevent()
         assert ev.name == "collectreport"
-        ev = slave.popevent()
+        rep = unserialize_report(ev.kwargs["data"])
-        assert ev.name == "collectreport"
-        rep = unserialize_report(ev.name, ev.kwargs['data'])
         assert rep.skipped
-        ev = slave.popevent("collectionfinish")
+        assert rep.longrepr[2] == "Skipped: hello"
-        assert not ev.kwargs['ids']
+        ev = worker.popevent("collectionfinish")
+        assert not ev.kwargs["ids"]
 
-    def test_remote_collect_fail(self, slave):
+    def test_remote_collect_fail(self, worker, unserialize_report):
-        slave.testdir.makepyfile("""aasd qwe""")
+        worker.testdir.makepyfile("""aasd qwe""")
-        slave.setup()
+        worker.setup()
-        ev = slave.popevent("collectionstart")
+        ev = worker.popevent("collectionstart")
         assert not ev.kwargs
-        ev = slave.popevent()
+        ev = worker.popevent()
         assert ev.name == "collectreport"
-        ev = slave.popevent()
+        rep = unserialize_report(ev.kwargs["data"])
-        assert ev.name == "collectreport"
-        rep = unserialize_report(ev.name, ev.kwargs['data'])
         assert rep.failed
-        ev = slave.popevent("collectionfinish")
+        ev = worker.popevent("collectionfinish")
-        assert not ev.kwargs['ids']
+        assert not ev.kwargs["ids"]
 
-    def test_runtests_all(self, slave):
+    def test_runtests_all(self, worker, unserialize_report):
-        slave.testdir.makepyfile("""
+        worker.testdir.makepyfile(
+            """
             def test_func(): pass
             def test_func2(): pass
-        """)
+        """
-        slave.setup()
+        )
-        ev = slave.popevent()
+        worker.setup()
-        assert ev.name == "slaveready"
+        ev = worker.popevent()
-        ev = slave.popevent()
+        assert ev.name == "workerready"
+        ev = worker.popevent()
         assert ev.name == "collectionstart"
         assert not ev.kwargs
-        ev = slave.popevent("collectionfinish")
+        ev = worker.popevent("collectionfinish")
-        ids = ev.kwargs['ids']
+        ids = ev.kwargs["ids"]
         assert len(ids) == 2
-        slave.sendcommand("runtests_all", )
+        worker.sendcommand("runtests_all")
-        slave.sendcommand("shutdown", )
+        worker.sendcommand("shutdown")
         for func in "::test_func", "::test_func2":
             for i in range(3):  # setup/call/teardown
-                ev = slave.popevent("testreport")
+                ev = worker.popevent("testreport")
                 assert ev.name == "testreport"
-                rep = unserialize_report(ev.name, ev.kwargs['data'])
+                rep = unserialize_report(ev.kwargs["data"])
                 assert rep.nodeid.endswith(func)
-        ev = slave.popevent("slavefinished")
+        ev = worker.popevent("workerfinished")
-        assert 'slaveoutput' in ev.kwargs
+        assert "workeroutput" in ev.kwargs
 
-    def test_happy_run_events_converted(self, testdir, slave):
+    def test_happy_run_events_converted(self, testdir, worker):
         py.test.xfail("implement a simple test for event production")
-        assert not slave.use_callback
+        assert not worker.use_callback
-        slave.testdir.makepyfile("""
+        worker.testdir.makepyfile(
+            """
             def test_func():
                 pass
-        """)
+        """
-        slave.setup()
+        )
-        hookrec = testdir.getreportrecorder(slave.config)
+        worker.setup()
-        for data in slave.slp.channel:
+        hookrec = testdir.getreportrecorder(worker.config)
-            slave.slp.process_from_remote(data)
+        for data in worker.slp.channel:
-        slave.slp.process_from_remote(slave.slp.ENDMARK)
+            worker.slp.process_from_remote(data)
-        py.std.pprint.pprint(hookrec.hookrecorder.calls)
+        worker.slp.process_from_remote(worker.slp.ENDMARK)
-        hookrec.hookrecorder.contains([
+        pprint.pprint(hookrec.hookrecorder.calls)
-            ("pytest_collectstart", "collector.fspath == aaa"),
+        hookrec.hookrecorder.contains(
-            ("pytest_pycollect_makeitem", "name == 'test_func'"),
+            [
-            ("pytest_collectreport", "report.collector.fspath == aaa"),
+                ("pytest_collectstart", "collector.fspath == aaa"),
-            ("pytest_collectstart", "collector.fspath == bbb"),
+                ("pytest_pycollect_makeitem", "name == 'test_func'"),
-            ("pytest_pycollect_makeitem", "name == 'test_func'"),
+                ("pytest_collectreport", "report.collector.fspath == aaa"),
-            ("pytest_collectreport", "report.collector.fspath == bbb"),
+                ("pytest_collectstart", "collector.fspath == bbb"),
-        ])
+                ("pytest_pycollect_makeitem", "name == 'test_func'"),
+                ("pytest_collectreport", "report.collector.fspath == bbb"),
+            ]
+        )
+
+    def test_process_from_remote_error_handling(self, worker, capsys):
+        worker.use_callback = True
+        worker.setup()
+        worker.slp.process_from_remote(("<nonono>", ()))
+        out, err = capsys.readouterr()
+        assert "INTERNALERROR> ValueError: unknown event: <nonono>" in out
+        ev = worker.popevent()
+        assert ev.name == "errordown"
+
+
+def test_remote_env_vars(testdir):
+    testdir.makepyfile(
+        """
+        import os
+        def test():
+            assert len(os.environ['PYTEST_XDIST_TESTRUNUID']) == 32
+            assert os.environ['PYTEST_XDIST_WORKER'] in ('gw0', 'gw1')
+            assert os.environ['PYTEST_XDIST_WORKER_COUNT'] == '2'
+    """
+    )
+    result = testdir.runpytest("-n2", "--max-worker-restart=0")
+    assert result.ret == 0
+
+
+def test_remote_inner_argv(testdir):
+    """Test/document the behavior due to execnet using `python -c`."""
+    testdir.makepyfile(
+        """
+        import sys
+
+        def test_argv():
+            assert sys.argv == ["-c"]
+        """
+    )
+    result = testdir.runpytest("-n1")
+    assert result.ret == 0
+
+
+def test_remote_mainargv(testdir):
+    outer_argv = sys.argv
+
+    testdir.makepyfile(
+        """
+        def test_mainargv(request):
+            assert request.config.workerinput["mainargv"] == {!r}
+        """.format(
+            outer_argv
+        )
+    )
+    result = testdir.runpytest("-n1")
+    assert result.ret == 0
+
+
+def test_remote_usage_prog(testdir, request):
+    if not hasattr(request.config._parser, "prog"):
+        pytest.skip("prog not available in config parser")
+    testdir.makeconftest(
+        """
+        import pytest
+
+        config_parser = None
+
+        @pytest.fixture
+        def get_config_parser():
+            return config_parser
+
+        def pytest_configure(config):
+            global config_parser
+            config_parser = config._parser
+    """
+    )
+    testdir.makepyfile(
+        """
+        import sys
+
+        def test(get_config_parser, request):
+            get_config_parser._getparser().error("my_usage_error")
+    """
+    )
+
+    result = testdir.runpytest_subprocess("-n1")
+    assert result.ret == 1
+    result.stdout.fnmatch_lines(["*usage: *", "*error: my_usage_error"])

testing/test_workermanage.py

@@ -1,14 +1,16 @@
 import py
 import pytest
+import textwrap
 import execnet
 from _pytest.pytester import HookRecorder
-from xdist import slavemanage, newhooks
+from xdist import workermanage, newhooks
-from xdist.slavemanage import HostRSync, NodeManager
+from xdist.workermanage import HostRSync, NodeManager
 
 pytest_plugins = "pytester"
 
 
-def pytest_funcarg__hookrecorder(request, config):
+@pytest.fixture
+def hookrecorder(request, config):
     hookrecorder = HookRecorder(config.pluginmanager)
     if hasattr(hookrecorder, "start_recording"):
         hookrecorder.start_recording(newhooks)
@@ -16,11 +18,13 @@ def pytest_funcarg__hookrecorder(request, config):
     return hookrecorder
 
 
-def pytest_funcarg__config(testdir):
+@pytest.fixture
+def config(testdir):
     return testdir.parseconfig()
 
 
-def pytest_funcarg__mysetup(tmpdir):
+@pytest.fixture
+def mysetup(tmpdir):
     class mysetup:
         source = tmpdir.mkdir("source")
         dest = tmpdir.mkdir("dest")
@@ -29,15 +33,15 @@ def pytest_funcarg__mysetup(tmpdir):
 
 
 @pytest.fixture
-def slavecontroller(monkeypatch):
+def workercontroller(monkeypatch):
-    class MockController(object):
+    class MockController:
         def __init__(self, *args):
             pass
 
         def setup(self):
             pass
 
-    monkeypatch.setattr(slavemanage, 'SlaveController', MockController)
+    monkeypatch.setattr(workermanage, "WorkerController", MockController)
     return MockController
 
 
@@ -47,14 +51,13 @@ class TestNodeManagerPopen:
         assert gm.specs[0].chdir is None
 
     def test_default_chdir(self, config):
-        l = ["ssh=noco", "socket=xyz"]
+        specs = ["ssh=noco", "socket=xyz"]
-        for spec in NodeManager(config, l).specs:
+        for spec in NodeManager(config, specs).specs:
             assert spec.chdir == "pyexecnetcache"
-        for spec in NodeManager(config, l, defaultchdir="abc").specs:
+        for spec in NodeManager(config, specs, defaultchdir="abc").specs:
             assert spec.chdir == "abc"
 
-    def test_popen_makegateway_events(self, config, hookrecorder,
+    def test_popen_makegateway_events(self, config, hookrecorder, workercontroller):
-                                      slavecontroller):
         hm = NodeManager(config, ["popen"] * 2)
         hm.setup_nodes(None)
         call = hookrecorder.popcall("pytest_xdist_setupnodes")
@@ -69,7 +72,7 @@ class TestNodeManagerPopen:
         hm.teardown_nodes()
         assert not len(hm.group)
 
-    def test_popens_rsync(self, config, mysetup, slavecontroller):
+    def test_popens_rsync(self, config, mysetup, workercontroller):
         source = mysetup.source
         hm = NodeManager(config, ["popen"] * 2)
         hm.setup_nodes(None)
@@ -86,32 +89,33 @@ class TestNodeManagerPopen:
                     pass
 
             gw.remote_exec = pseudoexec
-        l = []
+        notifications = []
         for gw in hm.group:
-            hm.rsync(gw, source, notify=lambda *args: l.append(args))
+            hm.rsync(gw, source, notify=lambda *args: notifications.append(args))
-        assert not l
+        assert not notifications
         hm.teardown_nodes()
         assert not len(hm.group)
         assert "sys.path.insert" in gw.remote_exec.args[0]
 
-    def test_rsync_popen_with_path(self, config, mysetup, slavecontroller):
+    def test_rsync_popen_with_path(self, config, mysetup, workercontroller):
         source, dest = mysetup.source, mysetup.dest
         hm = NodeManager(config, ["popen//chdir=%s" % dest] * 1)
         hm.setup_nodes(None)
         source.ensure("dir1", "dir2", "hello")
-        l = []
+        notifications = []
         for gw in hm.group:
-            hm.rsync(gw, source, notify=lambda *args: l.append(args))
+            hm.rsync(gw, source, notify=lambda *args: notifications.append(args))
-        assert len(l) == 1
+        assert len(notifications) == 1
-        assert l[0] == ("rsyncrootready", hm.group['gw0'].spec, source)
+        assert notifications[0] == ("rsyncrootready", hm.group["gw0"].spec, source)
         hm.teardown_nodes()
         dest = dest.join(source.basename)
         assert dest.join("dir1").check()
         assert dest.join("dir1", "dir2").check()
-        assert dest.join("dir1", "dir2", 'hello').check()
+        assert dest.join("dir1", "dir2", "hello").check()
 
-    def test_rsync_same_popen_twice(self, config, mysetup, hookrecorder,
+    def test_rsync_same_popen_twice(
-                                    slavecontroller):
+        self, config, mysetup, hookrecorder, workercontroller
+    ):
         source, dest = mysetup.source, mysetup.dest
         hm = NodeManager(config, ["popen//chdir=%s" % dest] * 2)
         hm.roots = []
@@ -134,12 +138,12 @@ class TestHRSync:
         source.ensure(".somedotfile", "moreentries")
         source.ensure("somedir", "editfile~")
         syncer = HostRSync(source, ignores=NodeManager.DEFAULT_IGNORES)
-        l = list(source.visit(rec=syncer.filter, fil=syncer.filter))
+        files = list(source.visit(rec=syncer.filter, fil=syncer.filter))
-        assert len(l) == 3
+        assert len(files) == 3
-        basenames = [x.basename for x in l]
+        basenames = [x.basename for x in files]
-        assert 'dir' in basenames
+        assert "dir" in basenames
-        assert 'file.txt' in basenames
+        assert "file.txt" in basenames
-        assert 'somedir' in basenames
+        assert "somedir" in basenames
 
     def test_hrsync_one_host(self, mysetup):
         source, dest = mysetup.source, mysetup.dest
@@ -163,42 +167,68 @@ class TestNodeManager:
         # assert nodemanager.config.topdir == source == config.topdir
         nodemanager.makegateways()
         nodemanager.rsync_roots()
-        p, = nodemanager.gwmanager.multi_exec(
+        (p,) = nodemanager.gwmanager.multi_exec(
-            "import os ; channel.send(os.getcwd())").receive_each()
+            "import os ; channel.send(os.getcwd())"
+        ).receive_each()
         p = py.path.local(p)
-        py.builtin.print_("remote curdir", p)
+        print("remote curdir", p)
         assert p == mysetup.dest.join(config.topdir.basename)
         assert p.join("dir1").check()
         assert p.join("dir1", "file1").check()
 
-    def test_popen_rsync_subdir(self, testdir, mysetup, slavecontroller):
+    def test_popen_rsync_subdir(self, testdir, mysetup, workercontroller):
         source, dest = mysetup.source, mysetup.dest
         dir1 = mysetup.source.mkdir("dir1")
         dir2 = dir1.mkdir("dir2")
         dir2.ensure("hello")
         for rsyncroot in (dir1, source):
             dest.remove()
-            nodemanager = NodeManager(testdir.parseconfig(
+            nodemanager = NodeManager(
-                "--tx", "popen//chdir=%s" % dest, "--rsyncdir", rsyncroot,
+                testdir.parseconfig(
-                source, ))
+                    "--tx", "popen//chdir=%s" % dest, "--rsyncdir", rsyncroot, source
+                )
+            )
             nodemanager.setup_nodes(None)  # calls .rsync_roots()
             if rsyncroot == source:
                 dest = dest.join("source")
             assert dest.join("dir1").check()
             assert dest.join("dir1", "dir2").check()
-            assert dest.join("dir1", "dir2", 'hello').check()
+            assert dest.join("dir1", "dir2", "hello").check()
             nodemanager.teardown_nodes()
 
-    def test_init_rsync_roots(self, testdir, mysetup, slavecontroller):
+    @pytest.mark.parametrize(
+        "flag, expects_report", [("-q", False), ("", False), ("-v", True)]
+    )
+    def test_rsync_report(
+        self, testdir, mysetup, workercontroller, capsys, flag, expects_report
+    ):
+        source, dest = mysetup.source, mysetup.dest
+        dir1 = mysetup.source.mkdir("dir1")
+        args = "--tx", "popen//chdir=%s" % dest, "--rsyncdir", dir1, source
+        if flag:
+            args += (flag,)
+        nodemanager = NodeManager(testdir.parseconfig(*args))
+        nodemanager.setup_nodes(None)  # calls .rsync_roots()
+        out, _ = capsys.readouterr()
+        if expects_report:
+            assert "<= pytest/__init__.py" in out
+        else:
+            assert "<= pytest/__init__.py" not in out
+
+    def test_init_rsync_roots(self, testdir, mysetup, workercontroller):
         source, dest = mysetup.source, mysetup.dest
         dir2 = source.ensure("dir1", "dir2", dir=1)
         source.ensure("dir1", "somefile", dir=1)
         dir2.ensure("hello")
         source.ensure("bogusdir", "file")
-        source.join("tox.ini").write(py.std.textwrap.dedent("""
+        source.join("tox.ini").write(
+            textwrap.dedent(
+                """
             [pytest]
             rsyncdirs=dir1/dir2
-        """))
+        """
+            )
+        )
         config = testdir.parseconfig(source)
         nodemanager = NodeManager(config, ["popen//chdir=%s" % dest])
         nodemanager.setup_nodes(None)  # calls .rsync_roots()
@@ -206,7 +236,7 @@ class TestNodeManager:
         assert not dest.join("dir1").check()
         assert not dest.join("bogus").check()
 
-    def test_rsyncignore(self, testdir, mysetup, slavecontroller):
+    def test_rsyncignore(self, testdir, mysetup, workercontroller):
         source, dest = mysetup.source, mysetup.dest
         dir2 = source.ensure("dir1", "dir2", dir=1)
         source.ensure("dir5", "dir6", "bogus")
@@ -214,27 +244,31 @@ class TestNodeManager:
         dir2.ensure("hello")
         source.ensure("foo", "bar")
         source.ensure("bar", "foo")
-        source.join("tox.ini").write(py.std.textwrap.dedent("""
+        source.join("tox.ini").write(
+            textwrap.dedent(
+                """
             [pytest]
             rsyncdirs = dir1 dir5
             rsyncignore = dir1/dir2 dir5/dir6 foo*
-        """))
+        """
+            )
+        )
         config = testdir.parseconfig(source)
-        config.option.rsyncignore = ['bar']
+        config.option.rsyncignore = ["bar"]
         nodemanager = NodeManager(config, ["popen//chdir=%s" % dest])
         nodemanager.setup_nodes(None)  # calls .rsync_roots()
         assert dest.join("dir1").check()
         assert not dest.join("dir1", "dir2").check()
         assert dest.join("dir5", "file").check()
         assert not dest.join("dir6").check()
-        assert not dest.join('foo').check()
+        assert not dest.join("foo").check()
-        assert not dest.join('bar').check()
+        assert not dest.join("bar").check()
 
-    def test_optimise_popen(self, testdir, mysetup, slavecontroller):
+    def test_optimise_popen(self, testdir, mysetup, workercontroller):
         source = mysetup.source
         specs = ["popen"] * 3
         source.join("conftest.py").write("rsyncdirs = ['a']")
-        source.ensure('a', dir=1)
+        source.ensure("a", dir=1)
         config = testdir.parseconfig(source)
         nodemanager = NodeManager(config, specs)
         nodemanager.setup_nodes(None)  # calls .rysnc_roots()
@@ -243,12 +277,15 @@ class TestNodeManager:
             assert not gwspec.chdir
 
     def test_ssh_setup_nodes(self, specssh, testdir):
-        testdir.makepyfile(__init__="",
+        testdir.makepyfile(
-                           test_x="""
+            __init__="",
+            test_x="""
             def test_one():
                 pass
-        """)
+        """,
-        reprec = testdir.inline_run("-d", "--rsyncdir=%s" % testdir.tmpdir,
+        )
-                                    "--tx", specssh, testdir.tmpdir)
+        reprec = testdir.inline_run(
-        rep, = reprec.getreports("pytest_runtest_logreport")
+            "-d", "--rsyncdir=%s" % testdir.tmpdir, "--tx", specssh, testdir.tmpdir
+        )
+        (rep,) = reprec.getreports("pytest_runtest_logreport")
         assert rep.passed

tox.ini

@@ -1,37 +1,50 @@
 [tox]
 envlist=
-  py{26,27,34,35}-pytest2{4,5,6,7,8},py{27,34}-pytest28-pexpect,flakes,readme
+  linting
-
+  py{35,36,37,38,39}-pytestlatest
+  py38-pytestmaster
+  py38-psutil
 
 [testenv]
-changedir=testing
+extras = testing
-passenv = USER USERNAME
 deps =
-    pycmd
+  pytestlatest: pytest
-    setuptools_scm # to avoid .eggs
+  pytestmaster: git+https://github.com/pytest-dev/pytest.git@master
-    pytest24: pytest~=2.4.0
-    pytest25: pytest~=2.5.0
-    pytest26: pytest~=2.6.1
-    pytest27: pytest~=2.7.2
-    pytest28: pytest~=2.8.3
-    pexpect: pexpect
 commands=
-  # always clean to avoid code unmarshal mismatch on old python/pytest
+  pytest {posargs}
-  py.cleanup -aq
-  py.test {posargs}
 
-[testenv:flakes]
+[testenv:py38-psutil]
+extras =
+  testing
+  psutil
+deps = pytest
+commands =
+  pytest {posargs:-k psutil}
+
+[testenv:linting]
+skip_install = True
+usedevelop = True
+passenv = PRE_COMMIT_HOME
+deps =
+  pre-commit
+commands = pre-commit run --all-files --show-diff-on-failure
+
+[testenv:release]
 changedir=
-deps = flake8
+decription = do a release, required posarg of the version number
-commands = flake8 setup.py testing xdist
+basepython = python3.7
-
+skipsdist = True
-[testenv:readme]
+usedevelop = True
-changedir =
+passenv = *
-deps = readme
+deps =
-skip_install = true
+  towncrier
-commands = python setup.py check -r -s
+commands =
-
+  towncrier --version {posargs} --yes
 
 [pytest]
-addopts = -rsfxX
+addopts = -ra
-;; hello
+testpaths = testing
+
+[flake8]
+max-line-length = 120
+ignore = E203,W503

xdist/__init__.py

@@ -1,2 +0,0 @@
-__all__ = ['__version__']
-from xdist._version import version as __version__

xdist/boxed.py

@@ -1,60 +0,0 @@
-
-import py
-
-
-def pytest_addoption(parser):
-    group = parser.getgroup("xdist", "distributed and subprocess testing")
-    group.addoption(
-        '--boxed',
-        action="store_true", dest="boxed", default=False,
-        help="box each test run in a separate process (unix)")
-
-
-def pytest_runtest_protocol(item):
-    if item.config.getvalue("boxed"):
-        reports = forked_run_report(item)
-        for rep in reports:
-            item.ihook.pytest_runtest_logreport(report=rep)
-        return True
-
-
-def forked_run_report(item):
-    # for now, we run setup/teardown in the subprocess
-    # XXX optionally allow sharing of setup/teardown
-    from _pytest.runner import runtestprotocol
-    EXITSTATUS_TESTEXIT = 4
-    import marshal
-    from xdist.remote import serialize_report
-    from xdist.slavemanage import unserialize_report
-
-    def runforked():
-        try:
-            reports = runtestprotocol(item, log=False)
-        except KeyboardInterrupt:
-            py.std.os._exit(EXITSTATUS_TESTEXIT)
-        return marshal.dumps([serialize_report(x) for x in reports])
-
-    ff = py.process.ForkedFunc(runforked)
-    result = ff.waitfinish()
-    if result.retval is not None:
-        report_dumps = marshal.loads(result.retval)
-        return [unserialize_report("testreport", x) for x in report_dumps]
-    else:
-        if result.exitstatus == EXITSTATUS_TESTEXIT:
-            py.test.exit("forked test item %s raised Exit" % (item,))
-        return [report_process_crash(item, result)]
-
-
-def report_process_crash(item, result):
-    path, lineno = item._getfslineno()
-    info = ("%s:%s: running the test CRASHED with signal %d" %
-            (path, lineno, result.signal))
-    from _pytest import runner
-    call = runner.CallInfo(lambda: 0/0, "???")
-    call.excinfo = info
-    rep = runner.pytest_runtest_makereport(item, call)
-    if result.out:
-        rep.sections.append(("captured stdout", result.out))
-    if result.err:
-        rep.sections.append(("captured stderr", result.err))
-    return rep

xdist/dsession.py

@@ -1,788 +0,0 @@
-import difflib
-import itertools
-from _pytest.runner import CollectReport
-
-import pytest
-import py
-from xdist.slavemanage import NodeManager
-
-
-queue = py.builtin._tryimport('queue', 'Queue')
-
-
-class EachScheduling:
-    """Implement scheduling of test items on all nodes
-
-    If a node gets added after the test run is started then it is
-    assumed to replace a node which got removed before it finished
-    its collection.  In this case it will only be used if a node
-    with the same spec got removed earlier.
-
-    Any nodes added after the run is started will only get items
-    assigned if a node with a matching spec was removed before it
-    finished all its pending items.  The new node will then be
-    assigned the remaining items from the removed node.
-    """
-
-    def __init__(self, numnodes, log=None):
-        self.numnodes = numnodes
-        self.node2collection = {}
-        self.node2pending = {}
-        self._started = []
-        self._removed2pending = {}
-        if log is None:
-            self.log = py.log.Producer("eachsched")
-        else:
-            self.log = log.eachsched
-        self.collection_is_completed = False
-
-    @property
-    def nodes(self):
-        """A list of all nodes in the scheduler."""
-        return list(self.node2pending.keys())
-
-    def hasnodes(self):
-        return bool(self.node2pending)
-
-    def haspending(self):
-        """Return True if there are pending test items
-
-        This indicates that collection has finished and nodes are
-        still processing test items, so this can be thought of as
-        "the scheduler is active".
-        """
-        for pending in self.node2pending.values():
-            if pending:
-                return True
-        return False
-
-    def addnode(self, node):
-        assert node not in self.node2pending
-        self.node2pending[node] = []
-
-    def tests_finished(self):
-        if not self.collection_is_completed:
-            return False
-        if self._removed2pending:
-            return False
-        for pending in self.node2pending.values():
-            if len(pending) >= 2:
-                return False
-        return True
-
-    def addnode_collection(self, node, collection):
-        """Add the collected test items from a node
-
-        Collection is complete once all nodes have submitted their
-        collection.  In this case its pending list is set to an empty
-        list.  When the collection is already completed this
-        submission is from a node which was restarted to replace a
-        dead node.  In this case we already assign the pending items
-        here.  In either case ``.init_distribute()`` will instruct the
-        node to start running the required tests.
-        """
-        assert node in self.node2pending
-        if not self.collection_is_completed:
-            self.node2collection[node] = list(collection)
-            self.node2pending[node] = []
-            if len(self.node2collection) >= self.numnodes:
-                self.collection_is_completed = True
-        elif self._removed2pending:
-            for deadnode in self._removed2pending:
-                if deadnode.gateway.spec == node.gateway.spec:
-                    dead_collection = self.node2collection[deadnode]
-                    if collection != dead_collection:
-                        msg = report_collection_diff(dead_collection,
-                                                     collection,
-                                                     deadnode.gateway.id,
-                                                     node.gateway.id)
-                        self.log(msg)
-                        return
-                    pending = self._removed2pending.pop(deadnode)
-                    self.node2pending[node] = pending
-                    break
-
-    def remove_item(self, node, item_index, duration=0):
-        self.node2pending[node].remove(item_index)
-
-    def remove_node(self, node):
-        # KeyError if we didn't get an addnode() yet
-        pending = self.node2pending.pop(node)
-        if not pending:
-            return
-        crashitem = self.node2collection[node][pending.pop(0)]
-        if pending:
-            self._removed2pending[node] = pending
-        return crashitem
-
-    def init_distribute(self):
-        """Schedule the test items on the nodes
-
-        If the node's pending list is empty it is a new node which
-        needs to run all the tests.  If the pending list is already
-        populated (by ``.addnode_collection()``) then it replaces a
-        dead node and we only need to run those tests.
-        """
-        assert self.collection_is_completed
-        for node, pending in self.node2pending.items():
-            if node in self._started:
-                continue
-            if not pending:
-                pending[:] = range(len(self.node2collection[node]))
-                node.send_runtest_all()
-            else:
-                node.send_runtest_some(pending)
-            self._started.append(node)
-
-
-class LoadScheduling:
-    """Implement load scheduling across nodes.
-
-    This distributes the tests collected across all nodes so each test
-    is run just once.  All nodes collect and submit the test suite and
-    when all collections are received it is verified they are
-    identical collections.  Then the collection gets divided up in
-    chunks and chunks get submitted to nodes.  Whenever a node finishes
-    an item, it calls ``.remove_item()`` which will trigger the
-    scheduler to assign more tests if the number of pending tests for
-    the node falls below a low-watermark.
-
-    When created, ``numnodes`` defines how many nodes are expected to
-    submit a collection. This is used to know when all nodes have
-    finished collection or how large the chunks need to be created.
-
-    Attributes:
-
-    :numnodes: The expected number of nodes taking part.  The actual
-       number of nodes will vary during the scheduler's lifetime as
-       nodes are added by the DSession as they are brought up and
-       removed either because of a dead node or normal shutdown.  This
-       number is primarily used to know when the initial collection is
-       completed.
-
-    :node2collection: Map of nodes and their test collection.  All
-       collections should always be identical.
-
-    :node2pending: Map of nodes and the indices of their pending
-       tests.  The indices are an index into ``.pending`` (which is
-       identical to their own collection stored in
-       ``.node2collection``).
-
-    :collection: The one collection once it is validated to be
-       identical between all the nodes.  It is initialised to None
-       until ``.init_distribute()`` is called.
-
-    :pending: List of indices of globally pending tests.  These are
-       tests which have not yet been allocated to a chunk for a node
-       to process.
-
-    :log: A py.log.Producer instance.
-
-    :config: Config object, used for handling hooks.
-    """
-
-    def __init__(self, numnodes, log=None, config=None):
-        self.numnodes = numnodes
-        self.node2collection = {}
-        self.node2pending = {}
-        self.pending = []
-        self.collection = None
-        if log is None:
-            self.log = py.log.Producer("loadsched")
-        else:
-            self.log = log.loadsched
-        self.config = config
-
-    @property
-    def nodes(self):
-        """A list of all nodes in the scheduler."""
-        return list(self.node2pending.keys())
-
-    @property
-    def collection_is_completed(self):
-        """Boolean indication initial test collection is complete.
-
-        This is a boolean indicating all initial participating nodes
-        have finished collection.  The required number of initial
-        nodes is defined by ``.numnodes``.
-        """
-        return len(self.node2collection) >= self.numnodes
-
-    def haspending(self):
-        """Return True if there are pending test items
-
-        This indicates that collection has finished and nodes are
-        still processing test items, so this can be thought of as
-        "the scheduler is active".
-        """
-        if self.pending:
-            return True
-        for pending in self.node2pending.values():
-            if pending:
-                return True
-        return False
-
-    def hasnodes(self):
-        """Return True if nodes exist in the scheduler."""
-        return bool(self.node2pending)
-
-    def addnode(self, node):
-        """Add a new node to the scheduler.
-
-        From now on the node will be allocated chunks of tests to
-        execute.
-
-        Called by the ``DSession.slave_slaveready`` hook when it
-        successfully bootstraps a new node.
-        """
-        assert node not in self.node2pending
-        self.node2pending[node] = []
-
-    def tests_finished(self):
-        """Return True if all tests have been executed by the nodes."""
-        if not self.collection_is_completed:
-            return False
-        if self.pending:
-            return False
-        for pending in self.node2pending.values():
-            if len(pending) >= 2:
-                return False
-        return True
-
-    def addnode_collection(self, node, collection):
-        """Add the collected test items from a node
-
-        The collection is stored in the ``.node2collection`` map.
-        Called by the ``DSession.slave_collectionfinish`` hook.
-        """
-        assert node in self.node2pending
-        if self.collection_is_completed:
-            # A new node has been added later, perhaps an original one died.
-            # .init_distribute() should have
-            # been called by now
-            assert self.collection
-            if collection != self.collection:
-                other_node = next(iter(self.node2collection.keys()))
-                msg = report_collection_diff(self.collection,
-                                             collection,
-                                             other_node.gateway.id,
-                                             node.gateway.id)
-                self.log(msg)
-                return
-        self.node2collection[node] = list(collection)
-
-    def remove_item(self, node, item_index, duration=0):
-        """Mark test item as completed by node
-
-        The duration it took to execute the item is used as a hint to
-        the scheduler.
-
-        This is called by the ``DSession.slave_testreport`` hook.
-        """
-        self.node2pending[node].remove(item_index)
-        self.check_schedule(node, duration=duration)
-
-    def check_schedule(self, node, duration=0):
-        """Maybe schedule new items on the node
-
-        If there are any globally pending nodes left then this will
-        check if the given node should be given any more tests.  The
-        ``duration`` of the last test is optionally used as a
-        heuristic to influence how many tests the node is assigned.
-        """
-        if node.shutting_down:
-            return
-
-        if self.pending:
-            # how many nodes do we have?
-            num_nodes = len(self.node2pending)
-            # if our node goes below a heuristic minimum, fill it out to
-            # heuristic maximum
-            items_per_node_min = max(2, len(self.pending) // num_nodes // 4)
-            items_per_node_max = max(2, len(self.pending) // num_nodes // 2)
-            node_pending = self.node2pending[node]
-            if len(node_pending) < items_per_node_min:
-                if duration >= 0.1 and len(node_pending) >= 2:
-                    # seems the node is doing long-running tests
-                    # and has enough items to continue
-                    # so let's rather wait with sending new items
-                    return
-                num_send = items_per_node_max - len(node_pending)
-                self._send_tests(node, num_send)
-        self.log("num items waiting for node:", len(self.pending))
-
-    def remove_node(self, node):
-        """Remove a node from the scheduler
-
-        This should be called either when the node crashed or at
-        shutdown time.  In the former case any pending items assigned
-        to the node will be re-scheduled.  Called by the
-        ``DSession.slave_slavefinished`` and
-        ``DSession.slave_errordown`` hooks.
-
-        Return the item which was being executing while the node
-        crashed or None if the node has no more pending items.
-
-        """
-        pending = self.node2pending.pop(node)
-        if not pending:
-            return
-
-        # The node crashed, reassing pending items
-        crashitem = self.collection[pending.pop(0)]
-        self.pending.extend(pending)
-        for node in self.node2pending:
-            self.check_schedule(node)
-        return crashitem
-
-    def init_distribute(self):
-        """Initiate distribution of the test collection
-
-        Initiate scheduling of the items across the nodes.  If this
-        gets called again later it behaves the same as calling
-        ``.check_schedule()`` on all nodes so that newly added nodes
-        will start to be used.
-
-        This is called by the ``DSession.slave_collectionfinish`` hook
-        if ``.collection_is_completed`` is True.
-
-        XXX Perhaps this method should have been called ".schedule()".
-        """
-        assert self.collection_is_completed
-
-        # Initial distribution already happened, reschedule on all nodes
-        if self.collection is not None:
-            for node in self.nodes:
-                self.check_schedule(node)
-            return
-
-        # XXX allow nodes to have different collections
-        if not self._check_nodes_have_same_collection():
-            self.log('**Different tests collected, aborting run**')
-            return
-
-        # Collections are identical, create the index of pending items.
-        self.collection = list(self.node2collection.values())[0]
-        self.pending[:] = range(len(self.collection))
-        if not self.collection:
-            return
-
-        # Send a batch of tests to run. If we don't have at least two
-        # tests per node, we have to send them all so that we can send
-        # shutdown signals and get all nodes working.
-        initial_batch = max(len(self.pending) // 4,
-                            2 * len(self.nodes))
-
-        # distribute tests round-robin up to the batch size
-        # (or until we run out)
-        nodes = itertools.cycle(self.nodes)
-        for i in range(initial_batch):
-            self._send_tests(next(nodes), 1)
-
-        if not self.pending:
-            # initial distribution sent all tests, start node shutdown
-            for node in self.nodes:
-                node.shutdown()
-
-    def _send_tests(self, node, num):
-        tests_per_node = self.pending[:num]
-        if tests_per_node:
-            del self.pending[:num]
-            self.node2pending[node].extend(tests_per_node)
-            node.send_runtest_some(tests_per_node)
-
-    def _check_nodes_have_same_collection(self):
-        """Return True if all nodes have collected the same items.
-
-        If collections differ, this method returns False while logging
-        the collection differences and posting collection errors to
-        pytest_collectreport hook.
-        """
-        node_collection_items = list(self.node2collection.items())
-        first_node, col = node_collection_items[0]
-        same_collection = True
-        for node, collection in node_collection_items[1:]:
-            msg = report_collection_diff(
-                col,
-                collection,
-                first_node.gateway.id,
-                node.gateway.id,
-            )
-            if msg:
-                same_collection = False
-                self.log(msg)
-                if self.config is not None:
-                    rep = CollectReport(
-                        node.gateway.id, 'failed',
-                        longrepr=msg, result=[])
-                    self.config.hook.pytest_collectreport(report=rep)
-
-        return same_collection
-
-
-def report_collection_diff(from_collection, to_collection, from_id, to_id):
-    """Report the collected test difference between two nodes.
-
-    :returns: detailed message describing the difference between the given
-    collections, or None if they are equal.
-    """
-    if from_collection == to_collection:
-        return None
-
-    diff = difflib.unified_diff(
-        from_collection,
-        to_collection,
-        fromfile=from_id,
-        tofile=to_id,
-    )
-    error_message = py.builtin._totext(
-        'Different tests were collected between {from_id} and {to_id}. '
-        'The difference is:\n'
-        '{diff}'
-    ).format(from_id=from_id, to_id=to_id, diff='\n'.join(diff))
-    msg = "\n".join([x.rstrip() for x in error_message.split("\n")])
-    return msg
-
-
-class Interrupted(KeyboardInterrupt):
-    """ signals an immediate interruption. """
-
-
-class DSession:
-    """A py.test plugin which runs a distributed test session
-
-    At the beginning of the test session this creates a NodeManager
-    instance which creates and starts all nodes.  Nodes then emit
-    events processed in the pytest_runtestloop hook using the slave_*
-    methods.
-
-    Once a node is started it will automatically start running the
-    py.test mainloop with some custom hooks.  This means a node
-    automatically starts collecting tests.  Once tests are collected
-    it will wait for instructions.
-    """
-    def __init__(self, config):
-        self.config = config
-        self.log = py.log.Producer("dsession")
-        if not config.option.debug:
-            py.log.setconsumer(self.log._keywords, None)
-        self.shuttingdown = False
-        self.countfailures = 0
-        self.maxfail = config.getvalue("maxfail")
-        self.queue = queue.Queue()
-        self._session = None
-        self._failed_collection_errors = {}
-        self._active_nodes = set()
-        self._failed_nodes_count = 0
-        self._max_slave_restart = self.config.getoption('max_slave_restart')
-        if self._max_slave_restart is not None:
-            self._max_slave_restart = int(self._max_slave_restart)
-        try:
-            self.terminal = config.pluginmanager.getplugin("terminalreporter")
-        except KeyError:
-            self.terminal = None
-        else:
-            self.trdist = TerminalDistReporter(config)
-            config.pluginmanager.register(self.trdist, "terminaldistreporter")
-
-    @property
-    def session_finished(self):
-        """Return True if the distributed session has finished
-
-        This means all nodes have executed all test items.  This is
-        used by pytest_runtestloop to break out of its loop.
-        """
-        return bool(self.shuttingdown and not self._active_nodes)
-
-    def report_line(self, line):
-        if self.terminal and self.config.option.verbose >= 0:
-            self.terminal.write_line(line)
-
-    @pytest.mark.trylast
-    def pytest_sessionstart(self, session):
-        """Creates and starts the nodes.
-
-        The nodes are setup to put their events onto self.queue.  As
-        soon as nodes start they will emit the slave_slaveready event.
-        """
-        self.nodemanager = NodeManager(self.config)
-        nodes = self.nodemanager.setup_nodes(putevent=self.queue.put)
-        self._active_nodes.update(nodes)
-        self._session = session
-
-    def pytest_sessionfinish(self, session):
-        """Shutdown all nodes."""
-        nm = getattr(self, 'nodemanager', None)  # if not fully initialized
-        if nm is not None:
-            nm.teardown_nodes()
-        self._session = None
-
-    def pytest_collection(self):
-        # prohibit collection of test items in master process
-        return True
-
-    def pytest_runtestloop(self):
-        numnodes = len(self.nodemanager.specs)
-        dist = self.config.getvalue("dist")
-        if dist == "load":
-            self.sched = LoadScheduling(numnodes, log=self.log,
-                                        config=self.config)
-        elif dist == "each":
-            self.sched = EachScheduling(numnodes, log=self.log)
-        else:
-            assert 0, dist
-        self.shouldstop = False
-        while not self.session_finished:
-            self.loop_once()
-            if self.shouldstop:
-                raise Interrupted(str(self.shouldstop))
-        return True
-
-    def loop_once(self):
-        """Process one callback from one of the slaves."""
-        while 1:
-            try:
-                eventcall = self.queue.get(timeout=2.0)
-                break
-            except queue.Empty:
-                continue
-        callname, kwargs = eventcall
-        assert callname, kwargs
-        method = "slave_" + callname
-        call = getattr(self, method)
-        self.log("calling method", method, kwargs)
-        call(**kwargs)
-        if self.sched.tests_finished():
-            self.triggershutdown()
-
-    #
-    # callbacks for processing events from slaves
-    #
-
-    def slave_slaveready(self, node, slaveinfo):
-        """Emitted when a node first starts up.
-
-        This adds the node to the scheduler, nodes continue with
-        collection without any further input.
-        """
-        node.slaveinfo = slaveinfo
-        node.slaveinfo['id'] = node.gateway.id
-        node.slaveinfo['spec'] = node.gateway.spec
-        self.config.hook.pytest_testnodeready(node=node)
-        if self.shuttingdown:
-            node.shutdown()
-        else:
-            self.sched.addnode(node)
-
-    def slave_slavefinished(self, node):
-        """Emitted when node executes its pytest_sessionfinish hook.
-
-        Removes the node from the scheduler.
-
-        The node might not be in the scheduler if it had not emitted
-        slaveready before shutdown was triggered.
-        """
-        self.config.hook.pytest_testnodedown(node=node, error=None)
-        if node.slaveoutput['exitstatus'] == 2:  # keyboard-interrupt
-            self.shouldstop = "%s received keyboard-interrupt" % (node,)
-            self.slave_errordown(node, "keyboard-interrupt")
-            return
-        if node in self.sched.nodes:
-            crashitem = self.sched.remove_node(node)
-            assert not crashitem, (crashitem, node)
-        self._active_nodes.remove(node)
-
-    def slave_errordown(self, node, error):
-        """Emitted by the SlaveController when a node dies."""
-        self.config.hook.pytest_testnodedown(node=node, error=error)
-        try:
-            crashitem = self.sched.remove_node(node)
-        except KeyError:
-            pass
-        else:
-            if crashitem:
-                self.handle_crashitem(crashitem, node)
-
-        self._failed_nodes_count += 1
-        maximum_reached = (self._max_slave_restart is not None and
-                           self._failed_nodes_count > self._max_slave_restart)
-        if maximum_reached:
-            if self._max_slave_restart == 0:
-                msg = 'Slave restarting disabled'
-            else:
-                msg = "Maximum crashed slaves reached: %d" % \
-                      self._max_slave_restart
-            self.report_line(msg)
-        else:
-            self.report_line("Replacing crashed slave %s" % node.gateway.id)
-            self._clone_node(node)
-        self._active_nodes.remove(node)
-
-    def slave_collectionfinish(self, node, ids):
-        """Slave has finished test collection.
-
-        This adds the collection for this node to the scheduler.  If
-        the scheduler indicates collection is finished (i.e. all
-        initial nodes have submitted their collections), then tells the
-        scheduler to schedule the collected items.  When initiating
-        scheduling the first time it logs which scheduler is in use.
-        """
-        if self.shuttingdown:
-            return
-        self.config.hook.pytest_xdist_node_collection_finished(node=node,
-                                                               ids=ids)
-        # tell session which items were effectively collected otherwise
-        # the master node will finish the session with EXIT_NOTESTSCOLLECTED
-        self._session.testscollected = len(ids)
-        self.sched.addnode_collection(node, ids)
-        if self.terminal:
-            self.trdist.setstatus(node.gateway.spec, "[%d]" % (len(ids)))
-        if self.sched.collection_is_completed:
-            if self.terminal and not self.sched.haspending():
-                self.trdist.ensure_show_status()
-                self.terminal.write_line("")
-                self.terminal.write_line("scheduling tests via %s" % (
-                    self.sched.__class__.__name__))
-            self.sched.init_distribute()
-
-    def slave_logstart(self, node, nodeid, location):
-        """Emitted when a node calls the pytest_runtest_logstart hook."""
-        self.config.hook.pytest_runtest_logstart(
-            nodeid=nodeid, location=location)
-
-    def slave_testreport(self, node, rep):
-        """Emitted when a node calls the pytest_runtest_logreport hook.
-
-        If the node indicates it is finished with a test item, remove
-        the item from the pending list in the scheduler.
-        """
-        if rep.when == "call" or (rep.when == "setup" and not rep.passed):
-            self.sched.remove_item(node, rep.item_index, rep.duration)
-        # self.report_line("testreport %s: %s" %(rep.id, rep.status))
-        rep.node = node
-        self.config.hook.pytest_runtest_logreport(report=rep)
-        self._handlefailures(rep)
-
-    def slave_collectreport(self, node, rep):
-        """Emitted when a node calls the pytest_collectreport hook."""
-        if rep.failed:
-            self._failed_slave_collectreport(node, rep)
-
-    def _clone_node(self, node):
-        """Return new node based on an existing one.
-
-        This is normally for when a node dies, this will copy the spec
-        of the existing node and create a new one with a new id.  The
-        new node will have been setup so it will start calling the
-        "slave_*" hooks and do work soon.
-        """
-        spec = node.gateway.spec
-        spec.id = None
-        self.nodemanager.group.allocate_id(spec)
-        node = self.nodemanager.setup_node(spec, self.queue.put)
-        self._active_nodes.add(node)
-        return node
-
-    def _failed_slave_collectreport(self, node, rep):
-        # Check we haven't already seen this report (from
-        # another slave).
-        if rep.longrepr not in self._failed_collection_errors:
-            self._failed_collection_errors[rep.longrepr] = True
-            self.config.hook.pytest_collectreport(report=rep)
-            self._handlefailures(rep)
-
-    def _handlefailures(self, rep):
-        if rep.failed:
-            self.countfailures += 1
-            if self.maxfail and self.countfailures >= self.maxfail:
-                self.shouldstop = "stopping after %d failures" % (
-                    self.countfailures)
-
-    def triggershutdown(self):
-        self.log("triggering shutdown")
-        self.shuttingdown = True
-        for node in self.sched.nodes:
-            node.shutdown()
-
-    def handle_crashitem(self, nodeid, slave):
-        # XXX get more reporting info by recording pytest_runtest_logstart?
-        # XXX count no of failures and retry N times
-        runner = self.config.pluginmanager.getplugin("runner")
-        fspath = nodeid.split("::")[0]
-        msg = "Slave %r crashed while running %r" % (slave.gateway.id, nodeid)
-        rep = runner.TestReport(nodeid, (fspath, None, fspath),
-                                (), "failed", msg, "???")
-        rep.node = slave
-        self.config.hook.pytest_runtest_logreport(report=rep)
-
-
-class TerminalDistReporter:
-    def __init__(self, config):
-        self.config = config
-        self.tr = config.pluginmanager.getplugin("terminalreporter")
-        self._status = {}
-        self._lastlen = 0
-
-    def write_line(self, msg):
-        self.tr.write_line(msg)
-
-    def ensure_show_status(self):
-        if not self.tr.hasmarkup:
-            self.write_line(self.getstatus())
-
-    def setstatus(self, spec, status, show=True):
-        self._status[spec.id] = status
-        if show and self.tr.hasmarkup:
-            self.rewrite(self.getstatus())
-
-    def getstatus(self):
-        parts = ["%s %s" % (spec.id, self._status[spec.id])
-                 for spec in self._specs]
-        return " / ".join(parts)
-
-    def rewrite(self, line, newline=False):
-        pline = line + " " * max(self._lastlen-len(line), 0)
-        if newline:
-            self._lastlen = 0
-            pline += "\n"
-        else:
-            self._lastlen = len(line)
-        self.tr.rewrite(pline, bold=True)
-
-    def pytest_xdist_setupnodes(self, specs):
-        self._specs = specs
-        for spec in specs:
-            self.setstatus(spec, "I", show=False)
-        self.setstatus(spec, "I", show=True)
-        self.ensure_show_status()
-
-    def pytest_xdist_newgateway(self, gateway):
-        if self.config.option.verbose > 0:
-            rinfo = gateway._rinfo()
-            version = "%s.%s.%s" % rinfo.version_info[:3]
-            self.rewrite("[%s] %s Python %s cwd: %s" % (
-                gateway.id, rinfo.platform, version, rinfo.cwd),
-                newline=True)
-        self.setstatus(gateway.spec, "C")
-
-    def pytest_testnodeready(self, node):
-        if self.config.option.verbose > 0:
-            d = node.slaveinfo
-            infoline = "[%s] Python %s" % (
-                d['id'],
-                d['version'].replace('\n', ' -- '),)
-            self.rewrite(infoline, newline=True)
-        self.setstatus(node.gateway.spec, "ok")
-
-    def pytest_testnodedown(self, node, error):
-        if not error:
-            return
-        self.write_line("[%s] node down: %s" % (node.gateway.id, error))
-
-    # def pytest_xdist_rsyncstart(self, source, gateways):
-    #    targets = ",".join([gw.id for gw in gateways])
-    #    msg = "[%s] rsyncing: %s" %(targets, source)
-    #    self.write_line(msg)
-    # def pytest_xdist_rsyncfinish(self, source, gateways):
-    #    targets = ", ".join(["[%s]" % gw.id for gw in gateways])
-    #    self.write_line("rsyncfinish: %s -> %s" %(source, targets))

xdist/plugin.py

@@ -1,101 +0,0 @@
-import py
-import pytest
-
-
-def parse_numprocesses(s):
-    if s == 'auto':
-        import multiprocessing
-        return multiprocessing.cpu_count()
-    else:
-        return int(s)
-
-
-def pytest_addoption(parser):
-    group = parser.getgroup("xdist", "distributed and subprocess testing")
-    group._addoption(
-        '-n', dest="numprocesses", metavar="numprocesses",
-        action="store",
-        type=parse_numprocesses,
-        help="shortcut for '--dist=load --tx=NUM*popen', "
-             "you can use 'auto' here for auto detection CPUs number on "
-             "host system")
-    group._addoption('--max-slave-restart', action="store", default=None,
-                     help="maximum number of slaves that can be restarted "
-                          "when crashed (set to zero to disable this feature)")
-    group._addoption(
-        '--dist', metavar="distmode",
-        action="store", choices=['load', 'each', 'no'],
-        type="choice", dest="dist", default="no",
-        help=("set mode for distributing tests to exec environments.\n\n"
-              "each: send each test to each available environment.\n\n"
-              "load: send each test to available environment.\n\n"
-              "(default) no: run tests inprocess, don't distribute."))
-    group._addoption(
-        '--tx', dest="tx", action="append", default=[],
-        metavar="xspec",
-        help=("add a test execution environment. some examples: "
-              "--tx popen//python=python2.5 --tx socket=192.168.1.102:8888 "
-              "--tx ssh=user@codespeak.net//chdir=testcache"))
-    group._addoption(
-        '-d',
-        action="store_true", dest="distload", default=False,
-        help="load-balance tests.  shortcut for '--dist=load'")
-    group.addoption(
-        '--rsyncdir', action="append", default=[], metavar="DIR",
-        help="add directory for rsyncing to remote tx nodes.")
-    group.addoption(
-        '--rsyncignore', action="append", default=[], metavar="GLOB",
-        help="add expression for ignores when rsyncing to remote tx nodes.")
-
-    parser.addini(
-        'rsyncdirs', 'list of (relative) paths to be rsynced for'
-        ' remote distributed testing.', type="pathlist")
-    parser.addini(
-        'rsyncignore', 'list of (relative) glob-style paths to be ignored '
-        'for rsyncing.', type="pathlist")
-    parser.addini(
-        "looponfailroots", type="pathlist",
-        help="directories to check for changes", default=[py.path.local()])
-
-# -------------------------------------------------------------------------
-# distributed testing hooks
-# -------------------------------------------------------------------------
-
-
-def pytest_addhooks(pluginmanager):
-    from xdist import newhooks
-    # avoid warnings with pytest-2.8
-    method = getattr(pluginmanager, "add_hookspecs", None)
-    if method is None:
-        method = pluginmanager.addhooks
-    method(newhooks)
-
-# -------------------------------------------------------------------------
-# distributed testing initialization
-# -------------------------------------------------------------------------
-
-
-@pytest.mark.trylast
-def pytest_configure(config):
-    if config.getoption("dist") != "no":
-        from xdist.dsession import DSession
-        session = DSession(config)
-        config.pluginmanager.register(session, "dsession")
-        tr = config.pluginmanager.getplugin("terminalreporter")
-        tr.showfspath = False
-
-
-@pytest.mark.tryfirst
-def pytest_cmdline_main(config):
-    if config.option.numprocesses:
-        config.option.dist = "load"
-        config.option.tx = ['popen'] * config.option.numprocesses
-    if config.option.distload:
-        config.option.dist = "load"
-    val = config.getvalue
-    if not val("collectonly"):
-        usepdb = config.getoption('usepdb')  # a core option
-        if val("dist") != "no":
-            if usepdb:
-                raise pytest.UsageError(
-                    "--pdb incompatible with distributing tests.")

xdist/remote.py

@@ -1,154 +0,0 @@
-"""
-    This module is executed in remote subprocesses and helps to
-    control a remote testing session and relay back information.
-    It assumes that 'py' is importable and does not have dependencies
-    on the rest of the xdist code.  This means that the xdist-plugin
-    needs not to be installed in remote environments.
-"""
-
-import sys
-import os
-
-
-class SlaveInteractor:
-    def __init__(self, config, channel):
-        self.config = config
-        self.slaveid = config.slaveinput.get('slaveid', "?")
-        self.log = py.log.Producer("slave-%s" % self.slaveid)
-        if not config.option.debug:
-            py.log.setconsumer(self.log._keywords, None)
-        self.channel = channel
-        config.pluginmanager.register(self)
-
-    def sendevent(self, name, **kwargs):
-        self.log("sending", name, kwargs)
-        self.channel.send((name, kwargs))
-
-    def pytest_internalerror(self, excrepr):
-        for line in str(excrepr).split("\n"):
-            self.log("IERROR>", line)
-
-    def pytest_sessionstart(self, session):
-        self.session = session
-        slaveinfo = getinfodict()
-        self.sendevent("slaveready", slaveinfo=slaveinfo)
-
-    def pytest_sessionfinish(self, __multicall__, exitstatus):
-        self.config.slaveoutput['exitstatus'] = exitstatus
-        res = __multicall__.execute()
-        self.sendevent("slavefinished", slaveoutput=self.config.slaveoutput)
-        return res
-
-    def pytest_collection(self, session):
-        self.sendevent("collectionstart")
-
-    def pytest_runtestloop(self, session):
-        self.log("entering main loop")
-        torun = []
-        while 1:
-            name, kwargs = self.channel.receive()
-            self.log("received command", name, kwargs)
-            if name == "runtests":
-                torun.extend(kwargs['indices'])
-            elif name == "runtests_all":
-                torun.extend(range(len(session.items)))
-            self.log("items to run:", torun)
-            # only run if we have an item and a next item
-            while len(torun) >= 2:
-                self.run_tests(torun)
-            if name == "shutdown":
-                if torun:
-                    self.run_tests(torun)
-                break
-        return True
-
-    def run_tests(self, torun):
-        items = self.session.items
-        self.item_index = torun.pop(0)
-        if torun:
-            nextitem = items[torun[0]]
-        else:
-            nextitem = None
-        self.config.hook.pytest_runtest_protocol(
-            item=items[self.item_index],
-            nextitem=nextitem)
-
-    def pytest_collection_finish(self, session):
-        self.sendevent(
-            "collectionfinish",
-            topdir=str(session.fspath),
-            ids=[item.nodeid for item in session.items])
-
-    def pytest_runtest_logstart(self, nodeid, location):
-        self.sendevent("logstart", nodeid=nodeid, location=location)
-
-    def pytest_runtest_logreport(self, report):
-        data = serialize_report(report)
-        data["item_index"] = self.item_index
-        assert self.session.items[self.item_index].nodeid == report.nodeid
-        self.sendevent("testreport", data=data)
-
-    def pytest_collectreport(self, report):
-        data = serialize_report(report)
-        self.sendevent("collectreport", data=data)
-
-
-def serialize_report(rep):
-    import py
-    d = rep.__dict__.copy()
-    if hasattr(rep.longrepr, 'toterminal'):
-        d['longrepr'] = str(rep.longrepr)
-    else:
-        d['longrepr'] = rep.longrepr
-    for name in d:
-        if isinstance(d[name], py.path.local):
-            d[name] = str(d[name])
-        elif name == "result":
-            d[name] = None  # for now
-    return d
-
-
-def getinfodict():
-    import platform
-    return dict(
-        version=sys.version,
-        version_info=tuple(sys.version_info),
-        sysplatform=sys.platform,
-        platform=platform.platform(),
-        executable=sys.executable,
-        cwd=os.getcwd(),
-    )
-
-
-def remote_initconfig(option_dict, args):
-    from _pytest.config import Config
-    option_dict['plugins'].append("no:terminal")
-    config = Config.fromdictargs(option_dict, args)
-    config.option.looponfail = False
-    config.option.usepdb = False
-    config.option.dist = "no"
-    config.option.distload = False
-    config.option.numprocesses = None
-    config.args = args
-    return config
-
-
-if __name__ == '__channelexec__':
-    channel = channel  # noqa
-    # python3.2 is not concurrent import safe, so let's play it safe
-    # https://bitbucket.org/hpk42/pytest/issue/347/pytest-xdist-and-python-32
-    if sys.version_info[:2] == (3, 2):
-        os.environ["PYTHONDONTWRITEBYTECODE"] = "1"
-    slaveinput, args, option_dict = channel.receive()
-    importpath = os.getcwd()
-    sys.path.insert(0, importpath)  # XXX only for remote situations
-    os.environ['PYTHONPATH'] = (
-        importpath + os.pathsep +
-        os.environ.get('PYTHONPATH', ''))
-    # os.environ['PYTHONPATH'] = importpath
-    import py
-    config = remote_initconfig(option_dict, args)
-    config.slaveinput = slaveinput
-    config.slaveoutput = {}
-    interactor = SlaveInteractor(config, channel)
-    config.hook.pytest_cmdline_main(config=config)

xdist/slavemanage.py

@@ -1,328 +0,0 @@
-import fnmatch
-import os
-import re
-
-import py
-import pytest
-import execnet
-import xdist.remote
-
-from _pytest import runner  # XXX load dynamically
-
-
-class NodeManager(object):
-    EXIT_TIMEOUT = 10
-    DEFAULT_IGNORES = ['.*', '*.pyc', '*.pyo', '*~']
-
-    def __init__(self, config, specs=None, defaultchdir="pyexecnetcache"):
-        self.config = config
-        self._nodesready = py.std.threading.Event()
-        self.trace = self.config.trace.get("nodemanager")
-        self.group = execnet.Group()
-        if specs is None:
-            specs = self._getxspecs()
-        self.specs = []
-        for spec in specs:
-            if not isinstance(spec, execnet.XSpec):
-                spec = execnet.XSpec(spec)
-            if not spec.chdir and not spec.popen:
-                spec.chdir = defaultchdir
-            self.group.allocate_id(spec)
-            self.specs.append(spec)
-        self.roots = self._getrsyncdirs()
-        self.rsyncoptions = self._getrsyncoptions()
-        self._rsynced_specs = py.builtin.set()
-
-    def rsync_roots(self, gateway):
-        """Rsync the set of roots to the node's gateway cwd."""
-        if self.roots:
-            for root in self.roots:
-                self.rsync(gateway, root, **self.rsyncoptions)
-
-    def setup_nodes(self, putevent):
-        self.config.hook.pytest_xdist_setupnodes(config=self.config,
-                                                 specs=self.specs)
-        self.trace("setting up nodes")
-        nodes = []
-        for spec in self.specs:
-            nodes.append(self.setup_node(spec, putevent))
-        return nodes
-
-    def setup_node(self, spec, putevent):
-        gw = self.group.makegateway(spec)
-        self.config.hook.pytest_xdist_newgateway(gateway=gw)
-        self.rsync_roots(gw)
-        node = SlaveController(self, gw, self.config, putevent)
-        gw.node = node          # keep the node alive
-        node.setup()
-        self.trace("started node %r" % node)
-        return node
-
-    def teardown_nodes(self):
-        self.group.terminate(self.EXIT_TIMEOUT)
-
-    def _getxspecs(self):
-        xspeclist = []
-        for xspec in self.config.getvalue("tx"):
-            i = xspec.find("*")
-            try:
-                num = int(xspec[:i])
-            except ValueError:
-                xspeclist.append(xspec)
-            else:
-                xspeclist.extend([xspec[i+1:]] * num)
-        if not xspeclist:
-            raise pytest.UsageError(
-                "MISSING test execution (tx) nodes: please specify --tx")
-        return [execnet.XSpec(x) for x in xspeclist]
-
-    def _getrsyncdirs(self):
-        for spec in self.specs:
-            if not spec.popen or spec.chdir:
-                break
-        else:
-            return []
-        import pytest
-        import _pytest
-        pytestpath = pytest.__file__.rstrip("co")
-        pytestdir = py.path.local(_pytest.__file__).dirpath()
-        config = self.config
-        candidates = [py._pydir, pytestpath, pytestdir]
-        candidates += config.option.rsyncdir
-        rsyncroots = config.getini("rsyncdirs")
-        if rsyncroots:
-            candidates.extend(rsyncroots)
-        roots = []
-        for root in candidates:
-            root = py.path.local(root).realpath()
-            if not root.check():
-                raise pytest.UsageError("rsyncdir doesn't exist: %r" % (root,))
-            if root not in roots:
-                roots.append(root)
-        return roots
-
-    def _getrsyncoptions(self):
-        """Get options to be passed for rsync."""
-        ignores = list(self.DEFAULT_IGNORES)
-        ignores += self.config.option.rsyncignore
-        ignores += self.config.getini("rsyncignore")
-
-        return {
-            'ignores': ignores,
-            'verbose': self.config.option.verbose,
-        }
-
-    def rsync(self, gateway, source, notify=None, verbose=False, ignores=None):
-        """Perform rsync to remote hosts for node."""
-        # XXX This changes the calling behaviour of
-        #     pytest_xdist_rsyncstart and pytest_xdist_rsyncfinish to
-        #     be called once per rsync target.
-        rsync = HostRSync(source, verbose=verbose, ignores=ignores)
-        spec = gateway.spec
-        if spec.popen and not spec.chdir:
-            # XXX This assumes that sources are python-packages
-            #     and that adding the basedir does not hurt.
-            gateway.remote_exec("""
-                import sys ; sys.path.insert(0, %r)
-            """ % os.path.dirname(str(source))).waitclose()
-            return
-        if (spec, source) in self._rsynced_specs:
-            return
-
-        def finished():
-            if notify:
-                notify("rsyncrootready", spec, source)
-        rsync.add_target_host(gateway, finished=finished)
-        self._rsynced_specs.add((spec, source))
-        self.config.hook.pytest_xdist_rsyncstart(
-            source=source,
-            gateways=[gateway],
-        )
-        rsync.send()
-        self.config.hook.pytest_xdist_rsyncfinish(
-            source=source,
-            gateways=[gateway],
-        )
-
-
-class HostRSync(execnet.RSync):
-    """ RSyncer that filters out common files
-    """
-    def __init__(self, sourcedir, *args, **kwargs):
-        self._synced = {}
-        self._ignores = []
-        ignores = kwargs.pop('ignores', None) or []
-        for x in ignores:
-            x = getattr(x, 'strpath', x)
-            self._ignores.append(re.compile(fnmatch.translate(x)))
-        super(HostRSync, self).__init__(sourcedir=sourcedir, **kwargs)
-
-    def filter(self, path):
-        path = py.path.local(path)
-        for cre in self._ignores:
-            if cre.match(path.basename) or cre.match(path.strpath):
-                return False
-        else:
-            return True
-
-    def add_target_host(self, gateway, finished=None):
-        remotepath = os.path.basename(self._sourcedir)
-        super(HostRSync, self).add_target(gateway, remotepath,
-                                          finishedcallback=finished,
-                                          delete=True,)
-
-    def _report_send_file(self, gateway, modified_rel_path):
-        if self._verbose:
-            path = os.path.basename(self._sourcedir) + "/" + modified_rel_path
-            remotepath = gateway.spec.chdir
-            py.builtin.print_('%s:%s <= %s' %
-                              (gateway.spec, remotepath, path))
-
-
-def make_reltoroot(roots, args):
-    # XXX introduce/use public API for splitting py.test args
-    splitcode = "::"
-    l = []
-    for arg in args:
-        parts = arg.split(splitcode)
-        fspath = py.path.local(parts[0])
-        for root in roots:
-            x = fspath.relto(root)
-            if x or fspath == root:
-                parts[0] = root.basename + "/" + x
-                break
-        else:
-            raise ValueError("arg %s not relative to an rsync root" % (arg,))
-        l.append(splitcode.join(parts))
-    return l
-
-
-class SlaveController(object):
-    ENDMARK = -1
-
-    def __init__(self, nodemanager, gateway, config, putevent):
-        self.nodemanager = nodemanager
-        self.putevent = putevent
-        self.gateway = gateway
-        self.config = config
-        self.slaveinput = {'slaveid': gateway.id}
-        self._down = False
-        self._shutdown_sent = False
-        self.log = py.log.Producer("slavectl-%s" % gateway.id)
-        if not self.config.option.debug:
-            py.log.setconsumer(self.log._keywords, None)
-
-    def __repr__(self):
-        return "<%s %s>" % (self.__class__.__name__, self.gateway.id,)
-
-    @property
-    def shutting_down(self):
-        return self._down or self._shutdown_sent
-
-    def setup(self):
-        self.log("setting up slave session")
-        spec = self.gateway.spec
-        args = self.config.args
-        if not spec.popen or spec.chdir:
-            args = make_reltoroot(self.nodemanager.roots, args)
-        option_dict = vars(self.config.option)
-        if spec.popen:
-            name = "popen-%s" % self.gateway.id
-            if hasattr(self.config, '_tmpdirhandler'):
-                basetemp = self.config._tmpdirhandler.getbasetemp()
-                option_dict['basetemp'] = str(basetemp.join(name))
-        self.config.hook.pytest_configure_node(node=self)
-        self.channel = self.gateway.remote_exec(xdist.remote)
-        self.channel.send((self.slaveinput, args, option_dict))
-        if self.putevent:
-            self.channel.setcallback(
-                self.process_from_remote,
-                endmarker=self.ENDMARK)
-
-    def ensure_teardown(self):
-        if hasattr(self, 'channel'):
-            if not self.channel.isclosed():
-                self.log("closing", self.channel)
-                self.channel.close()
-            # del self.channel
-        if hasattr(self, 'gateway'):
-            self.log("exiting", self.gateway)
-            self.gateway.exit()
-            # del self.gateway
-
-    def send_runtest_some(self, indices):
-        self.sendcommand("runtests", indices=indices)
-
-    def send_runtest_all(self):
-        self.sendcommand("runtests_all",)
-
-    def shutdown(self):
-        if not self._down:
-            try:
-                self.sendcommand("shutdown")
-            except IOError:
-                pass
-            self._shutdown_sent = True
-
-    def sendcommand(self, name, **kwargs):
-        """ send a named parametrized command to the other side. """
-        self.log("sending command %s(**%s)" % (name, kwargs))
-        self.channel.send((name, kwargs))
-
-    def notify_inproc(self, eventname, **kwargs):
-        self.log("queuing %s(**%s)" % (eventname, kwargs))
-        self.putevent((eventname, kwargs))
-
-    def process_from_remote(self, eventcall):  # noqa too complex
-        """ this gets called for each object we receive from
-            the other side and if the channel closes.
-
-            Note that channel callbacks run in the receiver
-            thread of execnet gateways - we need to
-            avoid raising exceptions or doing heavy work.
-        """
-        try:
-            if eventcall == self.ENDMARK:
-                err = self.channel._getremoteerror()
-                if not self._down:
-                    if not err or isinstance(err, EOFError):
-                        err = "Not properly terminated"  # lost connection?
-                    self.notify_inproc("errordown", node=self, error=err)
-                    self._down = True
-                return
-            eventname, kwargs = eventcall
-            if eventname in ("collectionstart"):
-                self.log("ignoring %s(%s)" % (eventname, kwargs))
-            elif eventname == "slaveready":
-                self.notify_inproc(eventname, node=self, **kwargs)
-            elif eventname == "slavefinished":
-                self._down = True
-                self.slaveoutput = kwargs['slaveoutput']
-                self.notify_inproc("slavefinished", node=self)
-            elif eventname == "logstart":
-                self.notify_inproc(eventname, node=self, **kwargs)
-            elif eventname in (
-                    "testreport", "collectreport", "teardownreport"):
-                item_index = kwargs.pop("item_index", None)
-                rep = unserialize_report(eventname, kwargs['data'])
-                if item_index is not None:
-                    rep.item_index = item_index
-                self.notify_inproc(eventname, node=self, rep=rep)
-            elif eventname == "collectionfinish":
-                self.notify_inproc(eventname, node=self, ids=kwargs['ids'])
-            else:
-                raise ValueError("unknown event: %s" % (eventname,))
-        except KeyboardInterrupt:
-            # should not land in receiver-thread
-            raise
-        except:
-            excinfo = py.code.ExceptionInfo()
-            py.builtin.print_("!" * 20, excinfo)
-            self.config.pluginmanager.notify_exception(excinfo)
-
-
-def unserialize_report(name, reportdict):
-    if name == "testreport":
-        return runner.TestReport(**reportdict)
-    elif name == "collectreport":
-        return runner.CollectReport(**reportdict)